ehmmm.. I been using them on my website but got this letter a few weeks ago :
It is with a heavy heart that we have to announce the closure of CoinPayments.net. FinCEN has ruled that Bitcoin is in their purview which would make us a money transmitter. We simply do not have the resources to register with FinCEN and most of the 50 states as a MSB and comply with all of the AML/KYC laws (and no realistic way to raise the funds to do so.)
The shutdown will happen in 3 stages:
1. We will stop accepting new user registrations effective immediately.
2. We will stop processing new transactions at 11:59:59 PM EST on March 24, 2014 (transactions already in progress at that time will be completed).
3. The website will otherwise remain operational until 11:59:59 PM EST on March 31st, 2014 when it will be shut down.
Check their site -- they sold the business to someone in the community who has all of the required paperwork and so they are no longer shutting down. Not sure why they haven't emailed with this update -- I'm signed up for them as well.