Someone asked for a bogner shiva review. I totally agree with pedalitis about trying new amps and broadening your knowledge about different amps and how they sound.
I've had a bogner shiva for a few years now - mine is the updated version with the bright switch and updated effects loop, EL34 - non reverb.
Features - 8.5: Nothing too flashy here, but it has everything you need in an amp. Its a channel switcher - one clean channel and one overdrive channel. There's a boost that you can use with either clean or the overdrive. Boost gives clean a BIG volume boost or a nice breakup, and gives the overdrive higher saturation and sustain. There are lots of ways to play with the controls to tweak volume / preamp overdrive / poweramp overdrive. Everything is switchable with a footswitch, reverb is an option.
Sound - 9: There's a reason for the hype. The clean channel is full and bell-like, to me its like a blend between a vox and fender clean. I personally think the cleans on my vibroverb are better, but as channel switchers go the clean is VERY good. It also has a lot of headroom, which makes the clean channel a very good complement for pedals.
Overdrive - this is where it's at - classic brown sound / Guns n Roses / Alice in Chains / Aerosmith. The most common description of this channel is that it's what a marshall is supposed to sound like, only better. I play the head through a Mesaboogie 4x12 with v30s, basically, instant hardrock heaven. By itself it doesnt do modern rock liquid lead tones like satriani / vai etc, but add an overdrive pedal and it does the trick perfectly. Fulltone FD2 into the overdrive channel = instant smooth and sustain. It wont get as heavy as the uberschall or recto though.
Overall -9: It's still my favourite amp. I've played and owned really nice tube amps from Mesa Boogie, Fender, Marshall, Fuchs, THD, which all do somethings really really well. I really think why the Shiva is so easily appealing is that it's just got a really good classic clean and classic rock tone, period. It sits very very well in a band mix because it has beautiful mids, and the the master volume actually makes it sound amazingly good at low volumes. Obviously everything sounds better louder....but hey, we don't live in a perfect world and unfortunately volume control is a reality in this one.