Are Quicksilver power tube amps in the same league as VAC, VTL, BAT, ARC, ...?

I guess they just discontinued the V4 Monos....   im sure something awesome is in the works....

The Tubes4Hifi Vacuum Tube Audio (VTA) tube amps are excellent bang for the buck. Their service and support is wonderful, and they have a significant following.

Their factory wired M-125 monoblocks (125wpc) are $2700 plus shipping, less if you buy in kit form.  

Quicksilver are great amps. They cut non-sonic corners to allow great sonic bang for the buck. ALL amps REGARDLESS of COST can be improved - or not - depending on the system in which they reside.

M-125s can be made great sounding and reliable. They are at best a 50-50 proposition out of the box.
See  ieLogical VTA M-125 for results after 2 years and hundreds of hours of work. Read from the top for the whole sorry Tubes4HiFi story. Dozens have written  with similar tales of woe.

I currently had an old pair of KT88 in my Mid Monos.... old, thousands of hours.  I thought it was time to replace and just retubed with JJ EL34.  These tubes sound great.   I had them before and one lost vacuum... I said that was my last pair but they sounded so good I had to give them another try

Warning; I own both a complex tubed amp-an ARC Ref 150 SE-and a fundamentally hair shirt simple amp-an Ampsandsound Nautilus SET. 
With that out of the way you may wonder why I consider my intro a warning. My answer would be that I have my biases. 
Take a look at the inside of an ARC Ref 150 SE 
 https://mans.io/item/audio-research/reference-150-se
Now take a look at the circuit of the A&S Nautilus
https://www.google.com/search?q=ampsandsound+nautilus&tbm=isch&hl=en&rlz=1C5CHFA_enUS872...
Quicksilver amps are much more akin to the latter. Sure they are push-pull and implement some negative feedback but they stick to fundamentals of tube amp design. So what at the end of the day does all this mean? Imho it means greater reliability, more midrange purity, less definition and leading edge transient snap/punch, and overall a softer more relaxed sound. The ARC build-a-beast-approach with 26+ banked capacitors and complex circuitry-for a tubed amp-helps explain why all said and done it does not sound all that different from a good SS amp though it does have the advantage of serving up to the loudspeaker a current based input rather than voltage based. 
The lower parts count and simplicity-not to mention lower overhead, advertising and mark-up, all allow Quickies to be much more reasonably priced. 
Are they the same at a miraculously low price? No. Are they a wise choice so long as you like the approach and sound signature? Hell yes. 

The Quicksilver amps look relatively easy to upgrade, e.g. better caps, being wired point-to-point and more classic than exotic; anyone doing that?