I've been using an n9 on this plan for about a month, and it seems to take care of most of my needs. Especially if you configure a google voice account with a simonics sip account. Then, your voice calls can be made as data instead of voice minutes. Don't try to get this plan in the store, they won't know what you're talking about. Order the sim online direct from Tmob and get a sim cutter online. They cost about 6 bucks. The only caveat is that you may not hear the first 3 or 4 seconds of outgoing calls when the other end answers. I also have a fairly new (8 month old) android phone and an n900.

The only things I miss when not using the android phone are the google music and amazon mp3 apps. Drive on the N9 is fine for my daily GPS, and Fennec with flash can take care of most other things that the default n9 browser can't handle.

My n900 is still on Gingerbread Nitdroid, and it seems to handle all the apps I want to use just fine. I haven't put ICS on the N9 yet, so I can't comment on that. I will say that Meego, even with it's shortcomings, is MUCH more pleasurable to use on a daily basis than android. Plus, it's lighter in the pocket (my android has a 4.3 inch screen). N9 for me has the best battery life, at 1.5 to 2 days of regular use. Android is second, and N900 is third. Both can get me through a full work day unless I'm constantly streaming something.