I took the plunge and asked the wife for a 91XG for my birthday. I thought it might be helpful to pass along some info on the experience...
1. If Ikea sold antennas, this would be thier favorite. Made in Asia and shipped in an impossibly small box, assembly is a royal PITA, but $52 for such a powerhouse antenna is worth it (and Solid Signal had it on my porch less than 30 hours after it was ordered).
2. There will be some busted knuckles, so a pair of tight leather gloves would really help.
3. To get the director tabs onto the boom without breaking them, I disassembled the boom sections and removed all of the hardware. I then pressed the tabs onto the ENDS of the boom sections, which is much easier because you can use your thumb to spread one of the tabs. Next, I slid each director down the boom to it's hole, and locked it in. After they were all on, I reassembled the boom and attached everything else (dipole, reflector, mount).
4. I was leery of the way the 3 boom sections are connected, but that went away after I installed the U-brace. Very solid once it's all together.
5. Judging the performance will take some time, as there is some tropo activity in my area that could be skewing the results. I will reserve any judgements until after I've seen it operate under nominal conditions. But first impressions are very good, especially for frequencies above 35.
6. The 91XG does indeed get VHF-high, as some others have reported. All 3 of my VHFs under 45 miles (on 7, 12, & 13) come in weak but steady, with the best reception achieved with the antenna aimed about 15 degrees off target. It's better than the ClearStream 4 on all three frequencies.
7. My UHF collection includes the ClearStream 4 and Winegards 9022 & 4400. These are excellent antennas that would satisfy most folks who just want to watch TV, but they don't have that extra juice that's needed to swim in the deep end of the pool, as in stations with noise margins below -5. I plan to sell the 9022 to my buddy who loves PBS but can't get one reliably with his DB2, and the C4 will probably be split up again into 2 C2s (I want to set one of them up as a camping antenna). The 4400 might end up on the roof in an attempt to reel in a very weak RF17 that the 4400 receives pretty well.