I've got one, love it, was my first Glock, but not my first handgun or my first .40. If you are new to handgunning, I would say that it might be worthwhile to get the Glock 26 instead, they are both great guns but the 27 does have a bit more flip to it than the 26. The 27 is definitely more accurate than you would expect, if you shoot reasonably well it can do some good work. I think I shoot mine better than my 23.
I guess if you just follow the fundamentals it doesn't really matter that much, and Advantage Arms sells a .22 conversion upper for it that will let you shoot for hours on the cheap. It's definitely a quality gun, I bought mine not liking Glocks, but I was getting my carry permit and I wanted to find the most trim .40 I could with reasonable capacity and a good reputation. Now I really kind of like Glocks, and I definitely appreciate them for what they are.