Ok, I'll be the first naysayer...
Thumbby Soft Massage Cone, Green
I bought this at the AMTA-WA convention and it seemed useful when I saw it demonstrated. But frankly I never use it anymore.
First of all, it should NOT be called thumby. It is no substitute for a thumb. The texture is not thumb-like: It continues giving where a thumb has a solid core of bone and can provide much firmer pressure. And a thumb is slenderer and can go places the thumby cannot (like under scapulae).
As vaguely touched on in another review, the thumby feels quite cold to the touch unless you have gone through the process of boiling it first--not something many of us have time or facilities to do at work.
But my biggest objection to this is that, sure, if you use this a lot you will potentially be saving wear and tear on your thumbs. BUT you will also be giving yourself carpal tunnel at the same time! Because the thumby requires putting significant pressure on the base of your hand, and frankly, hyperextending it. This is a great way to give yourself carpal tunnel.
The thumby comes with a bunch of written instructions (and you can access online videos as well) about all these other uses for the various surfaces of the thumby, but those just seem like someone with a lot of time on their hands and a background in marketing wracked their brain and came up with any possible use they could. Yeah, sure, I suppose I could roll the base around on the client's skin, but why? It's not going to save any wear and tear, and it's going to feel weird unless it's heated.
In closing, I have to wonder whether the folks who gave these other positive reviews *really* do deep pressure work. Because beyond superficial pressure, the thumby does NOT feel at all like a thumb to the client. There is no way these reviewers are using the thumby for something like XFF or thumb stripping with significant pressure and having clients tell them it feels like a thumb. I'd bet excellent money on that.