I don't know about SE but non-nokia symbian phones were quickly abandoned until now. Very few updates and very few people bothering with those phones (e.g. OmniaHD - awesome hardware, minimal support)

I love S60v5 with all it's non-polishness. Mainly because of backward compatibility (thousands of apps).

If you want a phone go for the Satio. If you want a tablet which happens to make phone calls then go for the N900.

S60 --> thousands of apps, numerous hacks, stuck with enormous controls eating up screen space, finest input methods, 360x640, you have to hack it to mess up with it, decent browser, sync with pretty much anything

Maemo --> root access from the first minute, pc-like apps, high resolution, stylus, you can develop (and host) a site on it! The only phone I have used that can last one full day of battery continuously connected to either wifi or 3g and with 4 IM accounts plus 2 email accounts active). Not-so-good e-mail app (no push), best mobile browser ever, full flash.
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