In Esperanto, "volo" apparently means "what one wishes or desires." This translation seems to be completely congruent with the beer selection of this bar, as there is literally hundreds of brews from which to choose. While I have to admit that barVolo arguably has the best selection of craft beers in the city (including yummy Dieu du Ciel), I can't quite decide if it's worth the price.
The bar itself has a wonderful aesthetic, but it's gastropub ambiance literally gets lost in the noise of its post-work (4à7) crowd. When you're ready to go for a second round of drinks, you'll probably have to go and line up at the bar amongst many other people. If you look on the bright side of things, the queue is a blessing in disguise in that you can actually look through the entire menu of beers on the chalkboard and order accordingly.
Even though barVolo rejects the idea of having conventional servers in its establishment (ie. you cannot order at your table), the bartenders tacitly absorb this service-centric role and maintain an extremely knowledgeable and kind demeanor. They are also keen on matching your tastebuds with the perfect beer if it's not too packed.
Logistically, I'd recommend going to barVolo pretty late (after 12am) to ensure you can get seats and drinks in a pretty quick manner. I'd also entirely avoid the food menu, as that is not their core competence.