2nd is what I start in around town, and slowly roll on the throttle so I don't suck Amps, although it does just fine accelerating. I use 1st when I want to really accelerate to get ahead of traffic, or show off
I sometimes get to third, but not usually until at least 35-40mph. I shift between 3rd/4th/5th on the highway depending on traffic.
I do like the transmission! I can get into the max power RPM range when I need the power, or get into the high-efficiency (~5k) range when I'm just cruisin around.
I've had a single speed elmoto too (my eVFR was working with lead acid and a series wound motor). One gear ratio was ok, but a few more ratios would have been nice. I had to build it to both hit top speed (highway), and put a large enough motor on it that it would accelerate acceptably and safely. If there was a transmission, I could have put a smaller motor on it, had good acceleration and top speed.... but the costs, weight and complexity of a DIY solution was too much, so I decided on a larger motor.
/end tangent