I just want to add to my initial review because I have recently swapped out the controller for a newer, power based controller from R1U - same as they use in the current 700 series. I've put about 30 miles on it so far. Thoughts are stream of consciousness.
I bought the controller from R1U for two reasons - hoping I would not have to cut/splice any plugs and because I used a friends new 700 briefly and felt the pedaling assist was much improved. They charged me $65 shipping included - a reasonable price. It was plug and play - no cutting or splicing was necessary. Its also the same size so it fits in the same space inside the frame, below the battery.
I did not replace the display - my friend's display looks exactly like mine. I did not see what her top speed allows - on my June 2020 display, the maximum speed setting allowed is 25 mph, not 28.
The throttle no longer has any level between 0 and 100%. Before the new controller, I could rest my thumb on the body of the throttle and rotate my thumb downwards and finesse the throttle to get various power outputs/speeds. Now, despite my best efforts, its either 0 watts or 750 watts - nothing in between is available.
Also, re: throttle - with the original controller I would get 999 watts when maxed out (anytime I had at least 48 volts on the battery). Now, its only 750 watts. Its also no where near as strong acceleration initially. Also, when in motion and pedaling, it takes a full one thousand one, one thousand two count for the throttle to kick in. This sucks - the old controller worked with maybe a half second delay.
I much prefer the original controller when it comes to the throttle. Let me say it again - I MUCH prefer the throttle with the original controller.
Now for some positive commentary. I bought the new controller because I was very tired of the speed based original controller (read my original post in this thread if you want to know what I'm talking about). Basically, each PAS level equaled a set speed. Very annoying when trying to ride with anyone else - I could not match their speed. The new controller allows me to vary my speed while in the same PAS level because it does not cut the power so dramatically once I hit a set speed. So it keeps giving me 125 watts whether I'm accelerating from a stop or I've reached whatever speed 125 watts gets me too - if I want to go faster, my pedal power adds to the motors output and I can go faster. Its not as good as the torque sensor on my Limited (for instance, on that bike I have three levels and level 1 can take me from 3 or 4 mph to about 15 mph), but my speed can vary about 4-5 mph while in the same PAS. I like this change a lot.
I have dropped from 9 to 5 PAS levels. I've set the power levels at 7%, 15%, 32%, 64% and 99%. I tried a little higher starting value of either 10% or 12%, but it would have me going at least 10 mph minimum - too fast for sidewalks or paths or around walkers. So I backed the level 1 PAS down a bit and prefer it. BTW, when I initially programmed it, I started at 10% and made each level 1.5X of the prior level. That did not seem to give me enough change in speed from one level to the next - if I went down a slope the started up the next, I would have to bump the PAS up two levels. Starting at 7%, I have roughly doubled the power with each setting. This does not double my speed, but gives a noticeable change in speed - hill descents/climbs now take one bump in the PAS.
I have each and every PAS from 0-5 set for 22 amps - I want the throttle active all the time, and I want boost when I want it.
I also tried 7 PAS levels initially, but did not feel it works as well as 5 PAS levels. My Limited works pretty well with 3 PAS levels because of the torque sensor, but I don't think I will try to use 3 PAS levels on the 700 - I think it would leave big gaps in speeds from one level to the next.
Overall, its been a mixed bag. I really, really don't care for the new throttle while the PAS levels are a fairly good improvement. It feels a lot more like riding a regular bicycle, and if I want to put some effort into it, it rewards me with extra speed instead of just reducing the power like the original controller used to do. I no longer get as much acceleration or maximum power from the motor whether by throttle or using PAS - I know the motor is capable of more, but is being held back by the new controller. I surmise that R1U has backed off on the power to increase longevity and reduce possible problems from folks who max the throttle for too long. I am going to keep the new controller in there because it rides more like a bike than an electric scooter, but I won't stop wishing that I had my old maximum power and throttle still.