Alright, round 1 of the Tiger Claw hidden decking fasteners challenge is in the history books. Great results, lotsa extra labor.
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We hoofed our bunk of 2x6 lumber to the project and started with 30' of dock at the launch. It came together very well, but took about 3 times as long as if we had just buzzed the screws in from the top. Granted, a good portion of this additional time is me doing my standard overkill of trying to make it perfect, but the Tiger Claw installation is pretty labor intensive. Nothing really muscle-challenging...just alot of steps to get a bond.
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The Tiger Claw clips seem whimpy to hold one in your hand. They're 16 Ga stamped stainless steel. I have never used these types of fasteners before, so I didn't know what to expect.

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They come with a plastic installation block. The prongs on one side of the clip slips inside slots in the face of the block. The opposing prongs are now set at the correct height and ready to be rapped into the leading edge of the last deck board fastened.

I had real reservations on this plastic setting block. It performed flawlessly, taking every hammer blow, both square and glancing. In fact, each 100 pc box of the fasteners has one of these blocks in with it, so D-ski kept 2 of them active, rotating with a fresh clip charge.
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A #8 x 2" stainless steel screw is then buzzed in at an approx 45 degree angle.

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We have 3 stringers running the length of this dock section, so one clip per stringer.

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There is some bull work required, and it is another one of the major time consumers. The next board is set by slamming it onto the prongs by use of an 8 lb sledge hammer. A shorter section of sacrificial 2-by stock is used to buffer the blows without damage to the deck board. Naturally, it is very important to have the bonding edge of this next board tight to the stringers as the prongs enter, so standing on this next deck board as the sledge swings helps to mitigate small amounts of bow and twist.-
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Overall opinion
I have built a fair amount of PT decks in my time. All have been screwed from the top with SS screws. They have all fared well, but the riddled surface detracts a point or two from the overall appearance. These clips leave no trace...nada. They take alot of extra time to install; this is the price you pay. Past that, though, when those prongs are set, it is one study little pc of hardware. The screw really does tighten it up like a banjo string. At the end of the installation, it looks fantastic. All the bonds between the deck boards and the stringers is tight and the seams are tight. I was worried that the protruding screw head might hinder a tight seam between deck boards. Enter Mr 8# sledge; good night. Oh yeah, I bought that Bo-Wrench gadget. Dang, it works good. I was a great help in squeezing out a little bit of the camber (the banana) I did have to deal with. Granted, it's next to impossible to remove camber on a 2 x 6 that's only 4' long, but it made that little bit of difference a perfectionist seeks. Yep, and the subsequent installation of the Tiger Claw clip and screw cranked it down and held it back.
The real test will be down the road as the summer sun further dries the deck boards. I expect the width to shrink; this is normal. Based on what I saw of the strength of these clips, I don't expect any problems with the installation as the cracks between the boards widen. The real question will be if the thickness shrinks (and I expect it probably will to some degree). How much of that tight, square bond will yield? If it does and the boards twist...hmmm. TBD.
Finally, another helpful tip for those considering use of these fasteners. I purchased them at Menards for $25 per 100 pc. They did not come with screws. The manufacturer does offer kits that come complete with all the screws. Home Depot lists it, but had make a special order in my area. I priced the complete kit out and found savings by buying the generic SS screws in 5# boxes from Menards, once again on sale. My generic screws worked just fine, but I noted that the heads protruded when seated. I wonder is the Tiger Claw screws have a slightly different head that would seat a little deeper within the clip hole...? Also, the Tiger Claw screw heads are finished in black oxide, as are the clips, to further hide them.