Wirelessly posted (8700 C: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)
Ramble logs me off a lot. Had IM+ and that seemed to do the same. Until I find one that does not log you off or charge you for SMS. ... I'm not paying for it. But ramble is the only free one that gets around SMS charges from what I understood.
i have an 8703e and Ramble works Great for me. Haven't been kicked off or anything, and messages are delivered as fast as if i were on a computer(IM'd myself, and others), no delay. Highly recommend.