TP2s have been activated on Boost, no problem. It is now much easier than before to get a Sprint-phone into Boost CDMA, using the automated online system on the Boost website.
Read here about the phones that have been successfully moved into Boost CDMA (almost all except the HTC Hero and Palm Pre)
http://howardforums.com/showthread.php?t=1528841
Read here on the new easier online method, which works every time, and is now the preferred way to move Sprint-branded phones like the TP2 into Boost CDMA:
http://howardforums.com/showthread.php?t=1582692
No offense to MetroPCS, but they are a regional carrier rather than a national one. What that means is that once you travel outside of a certain metro area you usually are "out of luck" with no phone connection whatsoever. I am in the Tampa Bay area, and if I drive just a few miles north and hit towns like Brooksville and Dade City (due 20 miles north of Tampa) there is no more service. That is why I dumped MetroPCS for Boost. Boost has a MUCH greater national footprint, utilizing the entire Sprint CDMA network, no comparison. Now I can drive anywhere I want in the entire state knowing that my phone will work just fine.
Further, that MetroPCS $50 unlimited deal usually comes out to $61 (it did for me) after fees and taxes. Boost CDMA costs me $51.77 per month, a full $10 cheaper than Metro.
Another thing: Many of the recently added MetroPCS cities (i.e. New York, Boston, Las Vegas, etc.) are on the AWS network, requiring AWS phones. Your TP2 is a CDMA phone and would not work in those cities at all, you would be completely blacked out. Not sure what band MetroPCS uses in Chicago, but you get the picture. More than half of MetroPCS' cities would be inaccessible to you because they went "AWS only" in those cities.