It certainly did some damage to my bank account but my Power Station II is well worth it. I did manage to get some pretty good tones using just the Marshall's 5W mode, as well as using a loop pot with the 20W mode, but both paled in comparison to using the 20W mode with the attenuator, and it's also much easier to dial in a great tone with the master up higher. It's hard to put the difference into words, since music transcends simple verbal communication, but 'bigger', 'fuller', 'crisper', 'more alive' come to mind. For me it's more about the feeling I get while playing; the first time I played through my SC20H + PSII, I felt the exhilaration I sometimes experience when everything is 'just perfect' in my world. It's more like a drug, really, along with the withdrawal if you wait too long to play again! The PSII has actually made all of my amps sound A LOT better. Since it took so long to arrive (~3 months) I had time to reconsider the purchase, and at the time I figured I would give it a quick test and return for a full refund, but after using it I was hooked. One thing I should mention, contrary to some of what might be found on the internet, this magic does not occur at whisper volumes. I use mine at levels from 'loud tv' to maybe that of two angry people yelling at each other, just below the level where neighbors might start to get really pissed off. Yeah, I originally thought I would be listening to a roaring Marshall at mouse fart volumes but nothing really sounds good that low (brain's interpretation of sound?). Mine is also a 're-amper', in that it contains a reactive load plus a 50W all tube power amp. So any amp you have, even my little 1W practice amp, can become a 50W amp. It also has a built-in FX loop that works really well, again very useful with my no frills practice amp, which now actually competes with its big brothers. It has a bunch of pre/post power amp tone controls to tailor your final sound but I don't use them much since the PSII is pretty transparent. Sorry for the lengthy post.