I recently got a Samsung YA-SBR510 Bluetooth Speaker System, and it works fine with my iPod touch 4g using Bluetooth. (sometimes the sound is a bit strange like theres a quiet buzzing sound, like if you have a bit of paper near your speaker and it's vibrating lol. Where as it sounds great when attached using the headphone cable, no buzzing at all).
But when I use it with my iPad 2, I usually can't listen to a whole album before the Bluetooth loses connection. Usually with only about 2 songs left. 🙁 (it also always has that vibrating sound, while with my iPod touch, usually reconnecting fixes the problem).
I have a Bodyguardz full body protector on my iPad 2, do you think maybe it's making the signal weaker? The sound reminds me of when listening to a slightly untuned radio station lol.