You're very welcome. I have dual VTF3's of the mk 3 variety. They do not offer the ported / sealed option. The VTF 15 was not offered when I bought my 1st. That ported / sealed option 'trickled down' to their other subs later... which became the mk 4. I had to choose one or the other, also. I chose ported, and the VTF 3 was their top tier ported sub at the time. FWIW, I was upgrading from a subwoofer in an entry level Onkyo HTIB. think , oh... fart box cheap.

For me, at the time, purchasing a $750 ish sub was quite the leap. The entire HTIB was right about $100. I first replaced the other speakers with Polk Monitor 70's, a CS2, and 50's for rears, and the little 'fart box' just couldn't hang. I spent many, many hours reading and researching, and hadn't even heard of HSU at the time. I'd never heard a 'real' subwoofer, at all. What I didn't want to do was buy something I wouldn't be happy with. I chose HSU for many reasons... user reviews, very few units for sale on the used market, good resale prices on the few completed sales on Ebay I could find, and even the warm fuzzy feeling I got from calling and talking to them... (thanks Pete, wherever you are!). After deciding that was the company I was comfortable purchasing from, I bought the best they offered. Trying to avoid the 'what if I'd only spent a little more..." second guessing I know that I would have done. I wanted the right tool the first time.
It was the day after my order went into 'shipped status', they introduced the VTF 15. Maybe two days. I did feel a little 'deflated'. I got over it quickly, though. Probably within 5 minutes of the delivery. Huge box. Wifey went

and I just went

After 5 minutes of setting it up and hitting the play button.... words just don't do justice to what I felt. Just a whole lot of



. Then wifey went

, said "I'm glad you're happy". She's a keeper.
Sorry to ramble... just sharing my experience. But, I still have no doubt the PSA is an incredible performer. They just didn't exist then. If they had, who knows. I do have family in Mineral Ridge, and was there (in that city) during their Grand Opening weekend, and really wanted to go... but it was not a good time... said goodbye to my grandmother.... she was 97. don't mean to be a downbringer, just wasn't a good time...
Again, my personal recommendation would be HSU, because that's what I own, and am extremely happy with their products. So much so, I bought a second, matching VTF 3. Here again, it was right before the mk4 was introduced... literally days before, but I don't regret it at all... my timing just sucks sometimes. S'ok, because it's easier to incorporate 2 identical subs... less options are sometimes better.

.
Either way, please report back with your decision, and your opinions after you get it (or them

) . It may help others facing a similar choice.
sincerely, Joseph