Is it worth it?

seems to me that the VTL mono block is a better amplifier!  Once I listened to my speakers (Rockport Mira Monitors at the time) through my audio research amp & preamp, and then listened to a similarly priced Pass Labs amp and pre.  They both played nicely, but the tube gear sounded better to my ears (and my wife's), so I re-sold the Pass gear.

I am seeing that the VTL amps you have are pretty expensive as are the Pass amps that you are considering.  You speakers are far less expensive than these amps.  I understand that money is not everything in evaluating audio gear, but many people (myself included) feel that the speakers should take up a very significant portion of the system budget.  Of course there is nothing wrong with having a great amplifier, and Revel speakers have a great reputation...  But a $5k speaker and a $15k amplifier, I would probably go the other way around, and seek out a $15k speaker and a $5k amplifier.  I think you will get a far bigger bump in performance that way.

VTL plays very nicely with Wilson.  Just some food for thought.

Vtl sounds great, but built quality is not so great .
Failed power tubes often affect other circuit components 

"But a $5k speaker and a $15k amplifier, I would probably go the other way around, and seek out a $15k speaker and a $5k amplifier.  I think you will get a far bigger bump in performance that way."

+1! I can tell you from recent, personal experience ... your speakers are THE most critical electronic component of your system. 

You’ve got damn good speakers that punch way above their class. Unless there’s something you don’t like about them you’ll have to spend a lot more to exceed their overall build and SQ.

Just me, but I don’t believe these VTL’s are better than the Pass amps. If you could do an A/B comparison that would tell you clearly which would sound better in your system. 

But the Pass .8 amps are top of the food chain 

 powerful VTL amps run very hot even in triode mode. normally in triode mode tubes run warm and safe to touch or definitely you can feel difference of air temperature barely close. In Ultra-Linear mode it's fireplace.

I don't think you need to spend that much money to get great sound from the F208s.  I have had my F208s for about five months.  I power them with Primaluna Dialogue HP integrated with KT150 tubes.  It sounds fantastic!  And, the amp was around $5k with the tubes.  

If you wanted to step it up, you could go with PL Dialogue HP mono block amps, and it would run around $7500 new and sound fantastic!  

I think spending all that money on the Pass amps is overkill for the F208s.  You can get seriously great sound for far less money, and have left over dollars to spend on music.

have you looked into the F208 Be's ?

Yes I seen and heard them at Axpona. Very Nice. Due to obvious listening room/ equipment differences it's hard to distinguish if they are worth the extra 5K.
Best regards
Mark