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Tried these crampons for three days now.  The first thing you notice is just how light and compact they are.  The second thing you notice is how painful they are to handle, they are just so sharp that adjusting the strap means getting pricked, and converting to a dual point likely means being stabbed.  I measured the monopoint weight at 338g per crampon and the dual point weight at 368g.  Unlike other monopoint crampons, there aren't those tiny secondaries around the mono, but I didn't test them with the mono.

The sizing is difficult, but I'm sure users of other crampons in the Harfang line will have experience here.  I fit them per instructions (leaving about a cm between the boot and back of the crampon) but after 3 pitches there was noticable slack in the strap, causing the front and rear pieces to sag, then come undone.  There are reviews out there that say the strap stretches when wet, but it's dyneema so that seems unlikely, if you know more lmk.  Once refit they stayed for the day, but the next day they popped while hiking and needed more tightening.

Also on the first day the nut came off the front point bolt, though we managed to find it, and coming home on the third day I checked and it again came undone and this time was gone.  I did convert to mono so there is a chance this is just user error, but I plan to use thread lock next time.

Edit:  After hearing from Blue Ice it seems that after adjusting the strap a bit of slack can enter the double-back heel.  The best way to remove the slack is to stomp the strap on a curb or something to force the slack out now instead of on the wall.  Because some slack will enter the strap, fit the strap as tight as possible (for me this meant the wire holding the heel lever just barely made it around my boot) with the heel lever adjustor fully down and latch it.  Then after stomping it adjustment with the dial should be enough.