I was a matte screen advocate, but jumped on a good deal on the 2011 sd glossy 15" after selling my AG HI-res 15" 2010 model. So far I'm loving the added contrast and a bit more vibrant colors. The glare is there, and with lots of backlights it can be a problem. I'm sure once I start taking it out in the sun, I'll be looking for spots with more shadow behind me, than I had to on the AG.
But so far it's not really been an issue. You quickly learn to ignore it and "see through" the glare, or adjust the angle of the screen. I wasn't entirely happy with the AG screen, as it was a bit too washed out and unclear for my eyes, especially with the hi-res, the text was a bit too small, and i found myself having to have my head closer to the screen. Now I can sit comfortably at a normal viewing distance without straining my eyes. I also usually had the AG screen at full or one tick from full brightness. With the glare screen, I can have it several ticks from full brightness. Also, no the AG had more bright areas towards the bottom of the screen, which was distracting when watching widescreen movies. The black boarders and higher contrast seem to get rid of this problem on the glare screen, which is an added bonus.
The AG screen though, makes your MBP weigh considerably and NOTICABLY less btw. It was very surprising, and took a while to get used to, that the glare screen was so heavy. Feels more firm and stable though, while the AG felt thinner, lighter and more easily bendable.