The system is "meh", I started out in this system and am graded as a 2nd degree black belt, The school's sparring style is stuck in 1980's style of karate, and seems allergic to MMA.
It was a style founded by Charles Warren, a black belt in kempo karate and goju karate, he started teaching both styles together as "teh deadly" hybrid. It does, I believe, has ties to Rodert Trais, and Adrian Emparado, as influeces to Mr. Warrens style.
It is practiced as a semi-contact/point style of karate, with "grappling" limited to a few foot sweeps and leg trips, and NO ground game.
self-defense is practiced thru one step sparring and waza.
Tom Hall was/is a Kempo-goju black belt that was a successful contender with a winning record in the PKA in the late 70's/ early 80's, who had some good bouts with "bad" Brad Hefton. Tom Hall did in fact, beat the Legandary Joe Lewis in PKA.
I think as far as "Karate" goes, it's better than most, but it's no where near Muay Thai or good solid Boxing. Lack of a solid cohesive ground game is another BIG problem.
They do list Jay Wilson as a Kempo-Goju black belt, and he in fact is a kickboxer, but he fights out of sanjira Muay Thai, and wins with Muay Thai, so IMO you could'nt use "Kempo-Goju FTW" in his fights.
They do have a fairly traditional link to a ryu for the short staff, and if traditional kubudo floats your boat, then it's o.k., but it aint no "Dog brothers" pack gathering.
The one million dollar question, "is it worthwhile?"
It's O.K., It's not bad karate.
It's not MMA, but that's o.k., not everything HAS to be MMA.