i use a JBL Micro Wireless. i have several friends who all have the skullyboom but i found the sound quality to be sub-par. sure you can only expect so much from a little portable speaker, but it was bad enough that i wasn't going to buy one of those. i opted for the JBL over the skullyboom because i don't care if my speaker looks like a squid or has purple stars on it, i want it to sound good. and JBL makes speakers, good ones. if i was 13 i might prefer the skullyboom but as an adult i have different priorities.
i will say, regardless of the brand you go with, riding with a wireless speaker is pretty awesome, no more headphone cords tangling in everything.
http://www.jbl.com/estore/jbl/us/pro...IRELESS_JBL_US