It is indeed, I do it all the time on my K750i (via Opera Mini
)
I've played with both a 6680 and N70 briefly and neither made me regret my choice of K750i in the slightest. The difference in size for me is pretty significant. Whilst I 'managed' with the size of the SE P800 (same size as N70) the difference a K750i sized phone makes is huge.
Certain people seem to have joystick issues with the K700i and K750i but 4 or 5 of my friends have had a K700i since they came out and have all just upgraded to the K750i and none have ever had any issues.
I'm not an SE fanboy and wouldn't have had any issue choosing a Nokia phone if there had been one around at the time that met my requirements. There wasn't.
Michael.