Any opinions on VTL mono-blocs MB450, etc ?

I have the Merlin VSM-M and considered the VTL 450's with the upgraded caps. I also considered the Cary v-12 and 805's. I ended up with the kt88 based McIntosh 2102. For me, I decided I did'nt need all that power from the VTL's and wanted more of a statement product like the Cary but was concerened with the power of the 805's in the other direction, not enough mabe? The v12 is not in the same league(pride of ownership wise) so the McIntosh was just right. I say bag the BW's and do a tube amp of your chioce with the Merlin's. I am very happy with them and the McIntosh combo.

you need to hear them in triode mode if you audition them its quite better sounding it has better resolution of small details example decay is resolved much more clearly echos in recordings are heard now which weren't perceptable in full power mode. The vocal's don't get any better than they are in triode mode. Truly magical presence. Bass response doesn't weaken in triode mode. If 200 watts is enough for your speakers triode mode is awesome.

I think both are very nice amps. I have the VTL 450s and a good friend has the VT200 (not the MkII I believe). I like my VTLs very much. They make my music sounds fabulous. The highest complement I can pay them is that while I have envisaged upgrades to various parts of my system (even the rack) from time to time, I have not once thought of upgrading the amps.

As to your questions...
1) Reliability: I have had my VTL MB 450 Signature monblocks for 14mos (bought used at the time) and they have had no problems whatsoever (knock on wood). I have not heard any dealers complaining about VTLs, even if they have competing products to sell (such as Jadis). Reliability seems to have been a bugbear for some in the past (see the archives here or over at audioasylum. It is probably worth asking your VTL dealer about this as well.
2) Weight: they are heavy - 35kg/80lbs apiece - and the weight is somewhat awkwardly placed within the chassis. They are not for people who like moving stuff around every week.
3) Heat: they put out some heat but it's not overbearing.
Notes on #2 and #3: The VT200 is heavy (I'd put it at ~50kg/120lb give or take) and puts out quite a bit of heat.

I agree with Mejames in that when/if you demo the VTL 450s, it is imperative to demo them in triode. While tetrode is very, very good, triode can be magic. I find the VT200 sounds somewhat "hard" when compared to the 450s in triode mode. If you don't need the 400-500 watts that the VTL 450s can provide in tetrode, you might also try the MB 250s, which offer 200WPC in triode only.

Another high-power tube amp you might consider in the same price range would be the Wolcott Presence 220 monoblocks (though I've never heard the Wolcotts, whenever I see comments about comparisons between the VTLs and the Wolcotts, the VTLs always seem to come out second best). I would also recommend trying the Counterpoint Natural Progression series (even though they are less tube amps than hybrid amps). I was very impressed with the monoblocks.

Thanks for all the feedback here.....also has anyone owned/listened to C-J Premier 12's? Would they be "better" than the ARC VT100? They are about the same price as the VTL MB450's, but have *only* 4 6550's each (as opposed to 8 6550's each in the VTL's). I'm asking because I always had the Premier 12's on my list of possible, someday, ultimate amps along with VTL's.

Steve