*Following is my own personal opinion, results may vary to yours*
I had a pair of the Monstervision RF (same as the Optomas) and a pair of the TrueDepth to compare at the same time. My set is a Samsung DLP with the "red tint" dlp-link. I first purchased the Monsters to have something "future proof". Only problem with the RF's and my set is that it didn't block the red tint from the dlp-link signal and it can't be turned off so it didn't work for me.
Slight edge to Monstervision as far as better finished seams/edges. Power button on TrueDepth is easy to press while I found the Monster/Optomas power button required more force. My first TrueDepth pair came scratched and some exposed material from under the frame on the front of the lens. Inside, Monster/Optomas frames are shiny while TrueDepth are matte finish. Monster/Optomas have a faint buzz that will be heard on complete silence but no issue with sound going on. I thought the smaller lenses on the TrueDepth was going to be an issue with the frame being on my field of view but it really isn't a problem. I however liked the bigger lenses of the Monster/Optomas. They both weight similarly
For comfort, I preferred the Monster/Optomas hands down. They fit like regular sun glasses and the soft rubber nose piece is pretty much perfect. Very easy to wear prescription glasses with since they rest on top of the protruding rubber nose piece nicely, so only the Monster/Optomas is resting on your nose (with my rather small/slim prescription frames). The legs are fairly straight so no pressure anywhere. Only disadvantage is that if they don't fit snug, they may slide off your face if you were to look down or swing your head around (who does that? lol). I wore these glasses with my prescriptions for hours without discomfort. I also use headphones alot.
TrueDepth have curved legs, depending on how snug they fit, there might be slight pressure around back overtime or slightly push your ears out (very annoying to me) or they may fit perfect! They are pretty secured when worn and won't slide off at all. It includes 3 nose pieces but none provide the fitment and comfort of the Monster/Optomas. While the nose pieces are made of rubber, they almost appear hard plastic and don't protrude out, making wearing prescriptions under them not so fun since now you have two pressure points. I find it uncomfortable and have to readjust every so often. Throw headphones on, and long sessions are very annoying for me. Without prescriptions, it's obviously better but still develops a pressure point on your nose after a while due to the hard nose piece (at least to me).
While the Monster/Optomas didn't block the "red tint" they both provided pretty much identical quality on bright scenes. Only dark scenes are tainted with the Monster/Optomas (with my TV) due to the excessive red dlp-link signal. While I always read that dlp-link glasses completely block the tint, yes but not 100%. There's still a trace of it but VERY minimal, hence the illusion of "true blacks". If you look at an angle, it comes thru more (except if looking with glasses minimally tilted down, pretty much all gone).
Brightness is equal. Both have the same hint of Blue/Green tint to the lenses and almost mirror shiny finish. What this finish brings about are reflections. Reflections come from whatever is illuminated behind you. Even in complete darkness, whatever your TVs light output illuminates behind you, will be reflected on both. If your are viewing with a big screen (projector), this won't be an issue as your complete "field of view" (or the whole lenses) are filled with picture and you won't see reflections on either one. One issue that stood out was with prescription glasses, the TrueDepth reflected back my prescreptions as well, while I did NOT see them with the Monster/Optomas. Strange but true.
RF of course no issues whatsoever, look/go anywhere and remain locked. TrueDepth, look anywhere but at the TV and after a few seconds looses sync. Look back at TV, wave your hand like a magic wand in front of the sensor and it re-syncs. However they hold up at a good distance as long as you look at the TV. Did a quick "daylight" sync test and it worked, can't say how they hold up. No daylight viewing for me.
Both have "reverse sync" feature but TrueDepth's is BY FAR easier implemented. One press of the power button (after initial power-up) to reverse sync and again to reverse back. Easy! Meanwhile, Monster/Optomas can be further calibrated with the RF's transmitter but out of the box where perfect (yes, I messed with the calibration, no further improvement). Both provided ghost free images.
Both provide the same excellent picture quality (although I wish they were brighter and color neutral). In the end, I returned the Monstervision because it can't block the red tint. But would be more than happy to pay the additional $10 ($69 shipped for TrueDepth when i purchased them) for the Monster/Optomas for the superior comfort and RF sync if they worked with my set.