That's a pretty easy 'bash' on Nokia, from any other dedicated manufacturer's longtime user. Kind of like us thinking of switching to SE, and trolling the SE forum claiming the same on the SE k790a or w810..... Not flaming or saying you are trolling or anything like that....I'm just saying the those claims are an easy conversation out on anyone not knowing the other side....instead of saying, 'no I don't know anything about Nokia's s60 phones.....they say, I just heard they suck.'
That being said.....Did you read the reviews linked in Post #4?
If you want a 'fast' Nokia, get something in the S40 OS. It will be similar to your SE experience.
If you want the cream of the crop, get just about any of the S60v3 OS based phones, N series or E series, the most popular here on HoFo being the N73, N80, N93, E61, etc.. At least, IMO based on threads.
WRT to the SLOW, Buggy, Random/Alot of Crashes...um...
1-Did you read the reviews linked in Post #4?
2-I've not had any problems with what you mentioned. Sluggish, sometimes, maybe, but not slow, IMO. I've had the phone over a month now, pretty loaded up with contacts and applications.
Remember when reading those reviews (and the comments on the 'buggy' software), that they are based on code (firmware) that was released over 6 months ago....there's been a couple of updates from Nokia.