I picked up my E51 2 weeks back. Earlier to this I was using an old Nokia for the past 3 years. I actually went to all the leading mobile review sites (techtree, GSMworld, etc) and based on the reviews picked this up. I picked this over another phone I was contemplating, the E61i.
2 weeks into it and here is the feedback. The phone has GREAT INTERFACE and doesn’t hang unlike other Nokia phones. Its zips between applications with smoothness. Has a camera with a decent resolution and cutting edge features compared to E61i. The amazing part was the easy with which one could browse the internet (view history, refresh, etc). You can store, play, skip songs with ease. Although the loudspeaker is activated to listen to MP3/Video files, you need to use the earplugs to hear the radio.
At the price it is being offered, the phone is a steal. I suggest you pick the steel black color as your finger smudges can be avoided (the phone has a glossy finish). The package box comes with a mobile pouch which is really handy and worth flaunting.
The phone is definitely value for money!