I've actually gone out of my way to install the Orange rom on to my unbranded DS from phones4u as it gives you the UMA app.
The rest of it is not such a pain as it used to be apart from the contacts backup that kept moaning about a lost connection, but if you search for the app in the market it offers an update that fixes this.
Mostly unobtrusive, orange boot screen and the usual links to orange services, plus a few games extra to the unbranded version I had before.
All worth it to get UMA for me.
Thanks! Really useful post. Mine has arrived now and I'm keeping it, despite the presence of the bloatware, because it's not as obtrusive as I thought it would be.
there is a link bunged in on the music player which links to Orange music which bugs me because its easy to accidentally hit, but (I'm new to android) I presume I can install a different player??
Traffic TV, Uno, Tetris, Orange Wednesdays, Orange Maps, Orange App Shop, Backup (now fixed, update fro app store as above), Orange Games, Orange Mail app (don't understand this yet), Orange Plus, Orange Photo and the Sims 3 are all on there but don't seem to take up too much space. I'd get rid of them all apart from Orange Wednesdays which was surprisingly nice to use and actually useful.
Also, the branded version seems to come with a HF kit which the wifes unbranded didn't?
Oh, and some of the clocks are an orange colour and you can't change it. Honestly /slaps head
but anyway, Its a keeper. Hope the battery improves, but then it dd get hammered yesterday :-)