I don't know about the 1200D ones, but the 2100D is AWESOME. It fits a huge range of horses. My 72" gelding is currently in an 80" and it works just fine on him with the smallest chest adjustment. It also fits my 78" mare fine, though she doesn't like blankets that rest on her neck at all. The belly straps are pretty long, but I cut the loop and shortened the straps. The new one, I didn't even bother to sew it back together, just burned the ends. It has stayed put thus far.
The 2100D is truly indestructable, hence why the gelding is in the huge one until the filly grows a bit more. She's wearing his right now since my mare didn't appreciate the blanket touching her neck. When her old Dover Dominick dies, I don't know what I'm going to do.
Last year TOTD had the 2000 denier pessoas for a little over $100. I snagged a medium weight turnout and it has worn extremely well. My horse basically lived in his last winter and he is turned out with a rowdy group of geldings most of the day. I also think they run true to size.
I have the heavyweight Tundra. It runs true to size. I was pleasantly surprised at how well this blanket has worn. I normally prefer Rambos but this blanket has really surpassed my expectations in how well it holds up and fits.
I got a pessoa turnout sheet and medium weight blanket on clearance a few years back for my youngster. It handled well in a field/herd situation. My only beef is the metal belly hooks. They feel cheap and my horse broke through one of them. I've never seen the actual metal on a blanket break before the webbing/elastic/what have you.
The only one I've seen in use didn't look like great quality. Within a couple weeks, it has 2 broken snaps, some trim was coming off and the neck cover velcro was almost completely detached. Not unusable, but annoying.
The newer Pessoa blankets and sheets that I have are very nice quality and I've been very happy with them. The Tundra was worn last year in a crummy boarding situation where all my other blankets were being destroyed, but this one held up well.
The older Pessoas were not as nice -- the fit was not good and the quality stunk. So don't judge the current Pessoa horsewear based on old versions (I'm thinking at least 5 years or so ago). At least, that is my experience.
I have a pessoa 1200D....LOVE IT! It is one of my favorite blankets. Only issue is one of the chest snaps broke but only because horse got caught on the stall door so I am glad it broke. And it was an easy and cheap fix. I got it on sale for just under $100 and I wish I had bought a couple different weights. It has held up well and is going on 3 years old!