Hey guys.
Im with 3 and have had excellent service from them apart from one hiccup but that was sorted fairly easily. I have been with them for 18 months and have just started a new 18 month contract.
3 do put their brand on the hardware of the phone, this is on 2 n95s Ive had, the logo is on the battery cover so if you didnt want the logo on the case of the phone, simply change the battery cover to one without the logo.
The only current factors with 3 mobiles is that they have locked their network coverage to 3g (for
n95-1) and they are not using the latest v20 firmware.
As for planet three, I hardly ever use it and is not important for my use.
If you debrand the phone and dont like the changes, simply rebrand it back to 3.
My experience with 3 has been really good, you are in contact with a consultant quickly should you call their helpline. If I had to be picky, the only gripe is that they only really have asian staff and sometimes its difficult to understand what they say and when you say one thing, they take it for another but on the whole, they are pretty cool and calm (especially when you get really upset and have to quite an aggressive tone ;) to get what you want).
If you want to ask anything else, please do, Ill be happy to try and help where I can.