One of my issues with OS5 has to do with alerts. Yes I can set an alert tone for SMS with OS5. However, if I use a custom ringtone for a contact, that ringtone for the phone, blocks the profile alerts. I now have to set a messages alert tone as well. And ALL messages for this person get the same tome. So now I can't tell the difference between a txt..needing and immediate response... vs e-mail which can be acted upon later.
Enter CrunchSMS. I can set Crunch to have an SMS alert tone that works on everyone... Just like the older versions of BB SMS... as it uses BB Sound Profiles. Big win for me.
So yes, I have it working on my 9700 with 188.8.131.520.
To get it on 5.0, go to http://crunchsms.com/install
using your BB browser.