I ordered these bottles (round version) to use on my HCigar VTInbox V3. After a little surgery on the tube (it's way too long) they perform brilliantly, since they are the same size as the originals.
The top cap holes work, but they could be made better IMHO. Basically just making them a tad larger would make them much more manageable. But it's still much more convenient to refill your squonk bottle this way than having to pull it off or even use a top filling bottle.
Service from Vaping101 was, as usually, splendid.