I haven't spent enough time with the Roland to comment. I compared the microcube to a Vox DA15, and I preferred the Vox (although the Roland had some good distortion models). The Vox had better cleans and, to my ear, better effects built-in. And the Valvetronix has, to my ear, better tone than the DA15.
During my last round of amp shopping I tried the Fender Frontman -- I don't remember why I rejected it, but I moved on to try other amps.
The spider had a lot of effects, but I didn't like the tone very much. For a modelling amp, I think a buyer is better off going with a Vox Valvetronix -- good cleans, very versatile, OK effects (except the auto wah!) built in, too.
For a bedroom amp, especially for beginners, I'd recommend going with a smaller digital modeller, like the Vox DA5 or Roland Microtube. At band volumes you'll need more volume, and the modellers aren't at their best when played loud. I recommend going for a small modeller, and then saving some money for a nice little 15-30W tube amp for playing at higher volumes.