I have to say, I'm really impressed and surprised with the M510 FC2.0 !
Noise wise, it's slightly louder/higher pitched than a Bosch Gen4 for example, but not in any unpleasant way.
Also on the noise front, it has the Gen4/EP8 rattle from the clutch on rough ground when you don't pedal.
Mine has E,E+,T (Tour), B (Boost) and R (Race). E-Mythique.
Support is consistent with the other motors except if anything the M510 has more lower and mid range support. Even if you ride awfully/Granny Style and find yourself in the wrong gear, it still pulls you through really strongly. Top end support, it feels similar to the Brose/Bosch Gen4 - I've not ridden it enough to really give an exact back to back on that. It certainly gives you as much as you need.
Assistance for effort, it gives more. Slightly too much really compared to what I'm used to but it just means using a lower assistance mode if you want a work out or more distance/altitude - otherwise you'll flatten the battery quicker than you intended to !
Start up, the way mine's set you have to rotate the cranks more on a steep start than the other motors (Startup Angle) - but this could be adjusted with Best Pro as it's not that easy to get going as it is by default.
Walk mode seems to work fine.
As it gives more assistance for effort and has a longer over run than a Bosch or a Brose, it takes a moment to re-adjust so you get nice gear changes ! You have to back off slightly more and slightly earlier, once you've got used to it, it's very natural and easy to ride smoothly.
The motor certainly is the "smoothest" of any motor I've tried with the transition from assisted to unassisted (25kph for me). It feels like it limits power slightly before 25kph but then ramps down after 25kph. The gen4 does something similar and ramps down between an indicated 25kph until an indicated 26.5 ish (GPS real 25). The M510 feels like it ramps down over a pre-set time period combined with a speed range - 2 seconds for example (I'm not sure exactly what it is). If you're absolutely gunning it as you hit the limit, you're still getting a reduced level of assistance afterwards, in my case upto 28kph at times as it smooths the transition rather than just dropping off. It's a really nice way to do it and makes it far easier to push on and ride without assistance than with the other motors :
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Its a bit early to say for sure, but I think it reduces power slightly as you near the limit - so if you're the kind of person who rides close to the limit a lot, I suspect de-restricting could have a more significant impact on existing range than it would on some other motors.
The DPC245 is a really nice clear display with all the information you would want. The extra screens with additional data are fantastic with lots of extra battery information you don't get with other systems.
The mode switch is also nice, small and works well.
Bluetooth is easy to setup/connect with "Go" and as that seems to have been re-vamped it works well with lots of useful information and theoretically the options to update firmwares over the air or from a local file (don't know if it works).
Great motor !