I had decided that my next amp was going to be in the 60+ range but I was this little one for $45 on Craiglist and just couldn't help myself. I haven't heard the spyders or the Cube15 but this thing sounds good to me. My other reference has been a MicroCube and a 30W Peavey bass amp. This one has as strong of a low end as the bass amp but, of course, does equally well on the highs.
It has so many models, effects, EQs and pre+post gains I don't know how long it will take me to find all the different tone this thing is capable of. I am having fun with it so far.
I am no authority on amps, far from it. But if you are considering a practice amp to play around with, you should plug into a Vypyr and check it out.