These are pretty decent baits. In my experience, it's nothing more than a solid-bodied tube jig. The Yamamoto variety might use a better manufacturing process (that might yield a lure with better action), but the end result is a tube jig that has a solid "tube" rather than hollow.
About 4 months ago I would've said I preferred this bait to the standard tube jig due to various hookset/rigging problems I was having with the hollow tube (tube would slide down the hook, fail to penetrate the plastic, etc.). However, once I got a better quality hook and started employing a touch of super glue here and there, the hollow tubes work just fine now. They're also cheaper and will emit tiny bubbles when they hit trees/plants/rocks under the water. Typically I just texas rig it -- they're great for flipping/pitching heavy cover as they have a skinnier profile than the standard jig'n'pig.
I've found the Yamamoto baits to be great (anything they make) -- but they are very soft and tear pretty easily. Somebody used to make this mini soldering-iron like thing for repairing plastics but I can't find it anymore.