I've been a BlueSoleil user now for almost 2 years or more.  The product is great, realiable and works... however that being said... bluetooth technology is bi-directional.  That means the other device that blue soleil is talking to is prone to problems too.   I have experienced over and over again network stack buffer overruns in not one but two top brand mobile phones namely: LG Vu and Samsung Impression. And yes this will cause the bluesoleil to give an error "Device busy" or other error.  The only solution, and I repeat the only solution is to reboot the phone.  And in worse cases the phone battery has to be removed.  Bluetooth anything can be headache.  I also have a GE wireless bluetooh phone for LAN line.  It too has its on unique problems.  But as for Blue Soleil, their products have never given me a problem directly.