Definitely + 1 for the Epic from me.
I discovered last year that my Elixir-fitting Epic kit also fits my mates Formulas… 🙂
Observation of all syringe-based kits: IMO the plunger seals in the syringes may well be the single most important part of getting an air free system. DOT brake fluid eats rubber seals over time. Old syringes are waste of time, hence I’d really need to be deperate to pay the money Avid want for theirs.
On the subject of using a Reverb kit… Reverbs use suspension oil not DOT4 or 5.1 brake fluid like your Avid brakes and you probably don’t want traces of suspension oil in your DOT braking system (not sure if it would matter to Shimano with mineral oil?) If I’d used a kit for a Reverb after doing anything with the hose I’d not be using it anywhere near my brakes, personally.