I upgraded from 4.0.1 to 4.0.2 without any issues today. MODs used:

Automatic Tagger from Content and Title
BBR - Resize Images with Lytebox 3.22
BBR - Useful Links on Member Action
GeekyDesigns Default Avatar
MARCO1 Advanced Quick Reply
Member Tracking
PhotoPost Pro
Seperate Sticky and Normal Threads
Spiders in WGO
Usergroup Color Bar
vBSEO 3.5.0 RC2
vBSEO 2.6 beta 1 Sitemap Generator

thought i'd pass this info on to those who are hesitant about upgrading.