if need more loop time without add on, get the RC50,
if need more time and saved loops, get the jamman coz its cf card friendly
if need drum loops and bassline, get a laptop, audio interface, software like ableton/reason, get drumloops and basslines online, install and play along while looping over and over plus real time manipulation of whatever parameters needed
boomerang more suitable for live looping and improvise looping/playing(compared to saving loops and playing back while having another instrument play over), shorter looping time as compared with boss/jamman
EH 16 sec and 2880 got that 4 beats irritating count in before the loop start(after stepping on the start record stomp switch). Unless EH already mod then sent out the product, if not, this is one of the shortcoming of the product(other than size and additional pedal for full usage of the pedal). I have the 16sec delay modded without the count in. It really rocks as a looping device cum improvised sound tweaker.