Been using my Helix for about 4 yrs now and love it!
Had it running my 20L tank when I got my first bp, then had it on my AP cage and now my Boaphile rack and it works like a charm.
I know the breeder I got my pastel and albino from uses nothing but Helix also, he swears by them as do I.
I just purchased a back up one when I got my rack. Got it from Reptile Basics and from the day I ordered til it was at my front door was like 2 days. Great place to do business with

Keeps temps in my cages solid and my mind at ease.