The BH550 is my studio/rehearsal/backup amp, and the BH800 is my primary gigging amp. I honestly can't say I've ever faced a situation where I felt that I was even pushing the BH800 hard, and I've used the BH550 for gigs a few times and never thought I needed 250 extra watts. I just decided, when I was shopping, just spend the little extra and get the BH800, since I found a good deal on the BH800. And then when it came time to get a second amp, I just got a BH550 instead.
I think the TC wattage scandal is worth knowing for one basic reason: it might be one of the reasons why it seems really easy to find BH550 or BH800 priced very attractively, whether new or used. It might be because some people are staying away from TC amps, but it's worth knowing that you shouldn't have to pay full sticker price for them. I bought my BH800 for $428 and BH550 for $350. These are incredible prices for the quality of amps I got. You just don't see deals like this on other amps of the same caliber. Hell, I sold my Aguilar TH500 for $549 and it sold very quickly, I probably could have gotten more for it. I don't miss my TH500 one bit, I'm so happy with the TC BH550/800. So yep, try to get the best price possible on the TC BH550 and don't just buy the full price because you might really save a lot.
There's a post on one of the threads here where a couple of users have compared a BH800 with a Mesa D800 and found them to perform similarly, with some favoring the BH800. And nobody questions the wattage handling of the Mesa D800, so I think informally, that BH800 passes. There's just not a lot of talk about either of these amps, but they're really great.