I used the original Tuck-This for some time with my M&P40c, which is very comparable in size to your 6906 (I actually carried Dad's 6906 in that very holster a few times). The holster is easy to put on and take off, very adjustable, holds the weapon securely, and the mag pouch sewn to the front is very handy. Price was not bad at all either.
The few things I didn't like were the tendency for the whole setup to flop down when dropping your pants (or pulling them up for that matter) though I believe this is remedied with the Tuck-This II, it has very defined edges when worn which make it more visible compared to other designs that blend the bulk of the holster back into your body, and it can be difficult to re-holster when wearing it. It also had a tendency to change its cant, which was both good and bad (sometimes became more comfortable when sitting).
Overall I was pretty happy with it, it suited my needs well for a while. I would suggest looking into something a bit more stable though, such as a Comp-Tac, Crossbreed Super-Tuck, or Kholster. You would probably be happier with one of them and they aren't that much more expensive.
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Fast is fine;accurate is final
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