Dual-slider design means some flaws, it's a Nokia and mostly it has a great build quality.
Display is smaller that that of it's 8Gb cousin, but it's still quite good. At 240*320 it's no Retina, but the colors are good.
Front camera-video-calling. But the back shooter is 5 MP beast with Carl-Zeiss Vario-Tessar optics. Great pictures, but software spoils them somehow.
Call quality and reception are just great, although the speaker is somewhat noisy at times.
You've a 332 MHz OMAP here, and tha'ts enough for your average Symbian needs. What is not enough is RAM.
There are lots of programs for Symbian and some are still coming out, but the platform is actually dead. You can rely only on the large community here.
3 years past and it's still the best Nokia smartphone.