I would second this. I'm a guitarist, and I very often compose songs by quickly pulling up an Apple Loop from the including Logic Studio Jam Packs, just to get a rough groove going, then writing on guitar. When it's time to record, I either send the song with the scratch loop to a live drummer, or program beats myself in either BFD, UltraBeat, or iDrum. When I use a "prefab" groove and tweak it, it's from Stylus RMX. But I find nothing as immediate as just quickly auditioning an Apple Loop, dragging it in, and enabling looping for the entire song.You know, if you are considering spending a few hundred dollars on a plug in to get better drum samples, you might want to consider spending that money on an upgrade to Logic Pro instead. You'll get Ultrbeat with all it's cool and modern sounding drum and percussion elements, an extended EXS 24 library with more drum sounds; PLUS all the Apple Loop Jam Pack libraries that get bundled with Pro. You'll probably find these very useful if you are looking for quick and dirty ways to get yourself practicing bass along with some loops!