This is my comparison of the Assioma Duo vs Team ZWATT

Usage:
ZWATT - 3000km
Assioma - 80km (3 rides only)

The Zwatt (Zimanox) is left only and got it from kickstarter after close to a year of waiting. Hasn't been an entirely smooth experience.

Signal strength:
Indoors

• Zwatt: Poor. Connecting to my Fenix 3, putting the watch under the crank arms (on the floor) still nets signal dropout. A Little better on my 910xt. But signal dropouts when i bought an out-front mount for the 910xt.
• Assioma : medium. Putting the Fenix 3 on a chair beside the pedals/crank - no dropouts. Putting it in front, on the laptop (running Golden Cheetah) - dropouts.
• Assioma / Zwatt indoors via Laptop on ANT+ stick with Golden Cheetah - No Issues. So, who you want to blame? Watches are supposedly known for poor ANT+ signal connectivity from what I've read.

Outdoors:

• Zwatt : OK. Fenix 3 on handlebar mount. 910xt on outfront mount occasional signal dropouts. Positioning is important
• Assioma: OK for Fenix3 on handlebar mount. Not connected to 910xt

Battery Life:
Zwatt: I've charged it possibly 3x for the 3000km I've ridden w/ it indoors and out. Supposedly rated at 250hrs per charge. But I would gladly trade off batt power for some signal strength boost
Assioma : TBD, but at 50hrs per charge and some reports of poor battery life after an airplane trip / bumps transporting bike in the car.

Clipin/Clipout strength:
I'm using the as supplied 9degree red cleats. Float is really loosey goosey. Literally feels putting on some ice skates and going for skating. Clip in tension is OK. Not a problem. Clip out tension - as default is REALLY tight. Like REALLY. This is despite loosening the spring tension to the Max (and the max still shows like 2 lines from the absolute min from the pedal. See pic later below). DCRainmaker review has some commenters suggestion ways to reduce the tension further. I took that advise and after some tries, i feel that it is now loads better/lighter. (the other alternative was to send the pedals back to Italy and ask Favero to fit some lighter springs.)

How i fixed mine - loosen the screw until it comes out (it doens't really come out but it will jut out). use the allen key to do per below pic and use the hands to pull on the rear of the pedal. Then tighten the screws a little. Works for me. YMMV


Power Comparison
This is from an outdoor ride. 55km with the F3 connected to the Assioma and the 910xt with the (left only) ZWATT.
Note that from the assioma, my power balance is 55% left, hence by logic, the ZWATT _should_ read higher.

This isn overlay.
PINK = Assioma DUO, Green = ZWATT

You can see that the Assioma is reading higher. (yes. both are zero off-set before the ride)
The Assioma is supposedly rated at +/-1% accuracy based on IAV, the Zwatt i think should be normal 2 or +/-3% possibly. Dunno.
GPLama has suggested that the assioma tends to "lose the watts" quicker vs his Quarq (IIRC) and I can see that below. Does that mean that it would also gain watts quicker? I have no clue.




Critical Power Comparison
Please don't mine my POOR power data. You can see that the Assioma are definitely reading higher. So is that a YAY for my FTP or basically just "who cares as long as consistent?" If there's the notion of "lose watts quicker" on the assioma, the below graph looks like it paints an alternate picture. At the _really_ short power up to 1min, up to 10% power Delta or 30watts.

Moving on to 10 or 20min it gets smaller but still close to 5-8watts or 3-5% difference.
At the end of the ride, the Assioma still reports a higher Power vs the ZWATT, about 5 watts for the entire ride.

Note : Remember I said that the ZWATT is left only and the Assioma is showing me being 55% Left balance predominant? Then how come ZWATT is showing lower reading? it should be higher as left only just doubles the power output readings.

Anyways - Food for thought and etc.



Power Delta as Percentage (Pink - Assioma is the zero reference)