We are happy with the ergonomics of LG GW520. We should also point out the very good build: it's an all plastic piece of gear but solid and quite durable. The handset handles nicely, the slider action is smooth and solid, and surfaces (except the screen) are fingerprint-proof.
The LG GW520 is not thin at all, but remains compact, and offers a secure hand hold. Operating with it is exceptionally comfortable in both single hand (quick tapping on the touchscreen) and two-hand scenarios. Typing on the QWERTY keyboard is quite fast as well and the handset has commendable balance with the slider up.