I have run the Hellfire for a while now and love it, my only complaint is the remote is the old style TX9 remote, if im playing a sound that is in the #3 slot and want #31 there is alot of scrolling to get there. You need good batteries to have the volume at 20 and still play, i do not use the best batteries and mine cuts out above 17, now at 17 the call is screaming and I find no need to ever play it that loud.
I just won an Inferno at the Renovo show and man did i fall hard for the remote. Like the higher end remotes you have categories that you can put specific sounds in ie coyote sounds only under coyote and so forth. The sound is clean and crisp for a small unit even at higher volume. Sounds download easily to both units, for the Inferno you have one extra step with arranging the categories how you want them,but worth every second of the set uptime, sort of like what order you want them on the Hellfire.
Another thing to check out is the new Banshee
I know the Banshee is more or less the same as the Hellfire but comes with the new remote, same as the Inferno, for only $50 more, also comes with 25 more preloaded sounds 100, of your choice, over the Hellfire"s 75. Currently the Banshee is out of stock and I believe Mike said they would be back on the shelf by October 1st but don't hold me to that date