I've had my G20 since 1995 and it has performed flawlessly. Contrary to Glock recommendations, I reload my own ammo and even cast my own lead bullets. This is a fun gun to shoot, and at the end of the day, I feel very good about loading a magazine of Double Tap factory defense loads and using this as my home defense handgun.
The newer Glocks have some nice features mine doesn't have, including a more ergonomic grip (the Hogue grip sleeve recently made my older G20 more comfortable and more accurate) and integral rails for hanging a tactical light or laser.
The only legitimate G20 complaint someone might have is the large grip. I have large hands and the G20 feels like it was designed for me, but those with smaller hands would probably not feel so comfortable or in control.
I want reliability and stopping power, and the G20 delivers in both categories. For value, reliability, out-of-the-box accuracy and user friendliness, it's hard to beat a Glock. Whether you want to plink at targets or you need a reliable defensive weapon. you'd be well advised to seek Glock perfection. The G20 is a great pick if you have large hands and want the added power of 15 rounds of full house 10 mm, especially if you don't need concealed carry.