I'm very happy with my Alky Controls meth kit from Livernois. As some know me, it took my 2 years before I pulled the trigger and bought the meth kit, in that time I had my conversations with Mike(BPD) about it.
I can't speak for the Snow system or other meth injections kits, but the Alky controls comes with a red/green led light that turns red to prime and green to fire. If that like doesn't come on, then you know your not spraying and back of the throttle. Also Alky uses the factory washer tank and uses the low washer fluid sensor, and if you get that low the warning will come up and the dash.
Figure on a full weekend to install, that's not rushing and talking your time. Mine wasn't a DD so I took longer than needed.
Also there is a life cycle or duty cycle with the pumps. Alky can rebuild there's for half the price of a new one. Mike told me to buy a spare pump, so when this one finally quits, I just swap it out and send the old one to Alky to rebuild and they will send it back.
The other issues is getting methanol. I got lucky that the local parts store is a VP dealer and can get M1 for me, so that is something to look into.
As for tuning, I'm sure AJP, Torrie will tune for what every meth setup you go with, Livernois will only tune for Alky Controls and use of M1.
Each has there pro's and con's, esp now with the new bigger DI pumps coming to market. Sounds like if you want to go full E85, is going to cost you $$$$, no matter the route you go.
I put my system on this past Feb and just went thru my first 5 gallons of M1, and that is 7 track days included, but in that same note, my car isn't a DD either.
Good luck in what you choice, either way you go you will be thrilled.