It's a full mech squonk mod, so not much can go wrong. As it uses those square bottles, I'd definitely order a few more as spares.
This review I just read through points out any flaws it may have:
Vandy Vape Requiem BF Kit Review
The manual adjusting 510 is fine - once you've done the first time, it's easy to do after that. As for the tight batteries, that may be a pay off of having a harder hitting mod. With the Armageddon MFG v2 bf mods we had the same problem. And learning to smack your mod worked with that one.
I'd go for it, and will probably get one myself. VV are using silver contacts so it will hit hard and it's got a safety switch to disable the button.