Disclaimer: this is my opinion based on very limited 'Net research. I have not heard an Alchemist, nor have I seen the innards of one. YMMV.
On the plus side, the amp was designed by Bogner, so it most likely will sound very good. It has on board FX which is a nice feature (if they've been implemented well, of course.)
The head
retails for $1100 or so, so it is not ridiculously expensive.
It has a 6L6-based, 40W class AB power section, which is good. The 6L6 is a nice sounding, if not neutral tube. The preamp is 5 12AX7s, so hopefully no modeling going on there. I'm assuming the FX are digital, which may or may not be a bad thing depending on your stance on digital FX.
On the downside: it is made in China. This doesn't bother me on a $150 Valve Junior, as it is so simple that I can fix it if breaks or mod it if I don't like the tone. Reliability is kind of sketchy coming out of China right now. You may get a great one, you may get a lemon. I'd definitely buy new after thoroughly checking out the warranty.
I tried the Spider Valve at GC a few months ago and thought it sounded pretty good at low volumes. I didn't get to crank it to ear bleeding levels.
The 6L6 is a fine tube, but it is a bit too neutral sounding for me. They sound great in Fender amps, but you have to push them a bit to get some warmth out of them, IMHO.
OTOH, if you like high gain preamp distortion, this may be the amp for you. The 6L6 is great in an application like this as the preamp does most of the work and the 6L6s provide some power amp warmth (much more so than transistors).
Make sure you read the
manual, especially the section at the end on the warranty. Warranty service is provided by Line 6.
So basically, to sum up: the Alchemist is a Bogner-designed, Chinese-made product, supported by Line 6.
My best advice to you is find one to try out in person and really run it through its paces. Play the ever liveing %#@& out of it to see how it responds.
HTH,
tung