I installed 3.5.2 and after the frustration with 3.5.1 I must say I'm happy with 3.5.2.
My main problems, at least for now, are with Opera and XMMS (couldn't run qpe-vexed, but that is secondary).
Beaming has gotten better, now I can beam contacts and other stuff, only thing I still don't know how to do is to connect to the internet with GPRS on my T300.
I replaced the package manager (saw it on another topic here) for AQPkg and opie-symlink, but in fact I don't use it to install software, only to check package names -- installing has been done with ipkg and ipkg-link thru ssh, as recommended on the release notes.
Congratulations to all developers! :^)