New to this forum, so my post is 18 mos. too late!
I have the white step-through Nitro, and think it looks much better than the alternative. It always gets compliments. I added black fenders, a Topeak rack, and crazy bright lights and an AirZound.
Then, the EBike shop got a used Stromer Sport in, and I bought it, and immediately noticed that, although made in the same factory, it was more refined. The front shocks put the Nitro to shame, and it was quieter. However, the battery had some strange charge/discharge issues, and while it was back at the store, a Stromer ST2S came in. So, traded the Sport in, and overall I am impressed. It does not have suspension however, and the mild suspension on the Nitro makes for a better ride. Also, the Nitro is far better at climbing steep hills, no matter how I adjust the Speed, Torque, and Agility on the ST2S. But, the ST2S is stealth quiet, the electronic shifting is amazing, and if you are into tech, this is the bike for you.
Got the carbon handlebar, upscale GP5 Ergons, and a Body Float. I am hoping that these will tame the ride a bit, and help with what I consider a too aggressive riding position. Using a helmet mounted mirror, it works on the Nitro, but the ST2S had you bent too far forward to use it.
Although I should sell the Nitro, the prices have dropped so low that I might as well hang onto it.