I have been working on pedal bikes for years so these TSDZ2, Photon, and X1 installs were easy. Nothing to figure out as they go on one way... well it might get more complicated if you wanted the X1 inside the triangle, I suppose.
As for this "Lightest" motor, I don't understand the fascination and emphasis on weight. When you have 1000W, a pound here and there is nothing. I DO understand how you BBS guys might be a little more sensitive to this what with the BBSHD being such a heavy pig. Seems to me that motor might be more suited to heavy duty cargo bikes. But the other mid motor kits in the ~7 pound range are plenty light enough. You can't even tell they are there from a bike handling perspective.
Normal non-ebike reply first: Yes, weight really doesn't count as much for performance on an e-bike as on a human-powered bike. And really, the lightweight mountain bikes are there to win 30-50 mile races. I'm getting tired of my 32mm stanchioned 3.2 lb $600 fork (MSRP $1400) --- it's great on paper but you can really feel the flex when going down rocky or washboard areas of the trail. Yes, it is very fast on hardpack, yes it can really put up surprisingly good numbers compared to other bikes & riders who actually know what they are doing (as in I'm on a hardtail, flat pedals, 27.5 tires, all supposedly inferior), and yes the fork has won World XC Races. But for everyday run of the mill trail riding, I'm getting sick of it. The bike is 24.5 lbs right now including dropper post. Adding a pound to put on a 34 fork that's much stiffer and can handle chunky, rutted terrain better would for sure help, and the timed segment runs may not even change much either way, or may improve a bit overall, we'll see later. Sometimes, especially if you are not racing, it's not just about the component on paper or the performance numbers, it's about having fun, the ability to handle the trail good, and comfort.
E-bike reply second: the weight weenie stuff applies to both kinds of bikes --- if you are going to try and save weight, you have to do it with multiple components, not just one. The lightest version of this thread's kit has the 250W motor paired with a small 36V battery. So yes it is lighter for the motor and battery than the other brand-name motor/batteries on Trek / Marin / Nukeproof / Orbea / Santa Cruz and others. But let's look at the Specialized S-Works Turbo Kenevo SL. 42 lbs with 170 mm of front suspension travel in an e-bike. Excellent, considering most Enduro FS non-ebikes are at least 32 lbs and many are 38 lbs. But the motor only puts out 32 Nm and the whole thing costs $15,000 USD. That's just ridiculous. OK, so you get a more natural bike feel with 42 total lbs, but I would for sure try this thread's kit mated to a carbon hardtail or even FS frame first and still save a ton of money doing the conversion. And a bike that should end up 40-45 lbs. With more torque.
I was a little bummed my hardtail ended up 50 lbs with the 9 lb motor, 9 lb battery, and 5 lbs of extra stuff like the controller, display, motor mounts, cables, etc. ). Thought it end up more like 45-48 lbs. But it's OK. It can still pedal w/o motor on a flat surface just fine, and slight uphills w/o motor are not nearly as bad as I assumed they would be. (I am more in shape now than before, apparently!). 5 lbs of weight difference on an e-bike is barely even noticeable. My hub drive bike is 55 lbs and I just slightly notice the 5 lb difference.
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