I'm assuming that you're referring to the Japan Karate Shoto Renmei?
If it's a group that traces its lineage back to Asai Sensei, then they're the real deal.
Just as a bit of background (any number of online bio's will also state this), Asai Sensei was one of the higher-ups with the Japan Karate Association, and also one of its technical directors, so he had an excellent eye for technique, fundamentals, physical training, flexibility, adaptability, etc.
If the group you mentioned adhered to what Asai Sensei's methods, then they should be a technically sound one.
I had the pleasure of training with one of the people who was under Asai Sensei, Kos Yokota, and came out of that seminar with quite an appreciation for their teachings. He really put a focus on how you can optimize bodily mechanics.
For that matter, even though Yokota Sensei is in his 60's, I would swear that he's in amazing physical condition, and has the physical abilities of a man half his age...