Better for noobs and kids but soft start otherwise sucks. No good for offroad or if you're used to having a reasonable amount of power on tap.
The good news is I'm pretty sure with the V3 CA that sort of thing is selectable so you can disable the soggy performance if you want.
With a proper 250w motor though you don't need a soft start controller, a 36v controller @ 10 amps is all the soft start you need!
whatever, what's your location ? I've never spoken to a cop who knows that much about ebikes, let along carries a folder on them.
Sounds like they'll soon start carrying dossiers on key members of the ebike community.
"base, be advised I'm in pursuit of a suspected over 250w ebike. Rider is pedalling at 40km/hr but doesn't seem to be working too hard, I'm moving in for a closer look"
"roger that 26, proceed with caution"
"base, rider has a large rear hub motor and what appears to be a concealed 18 fet controller, I'm going to need backup!"
"roger that 26, 2 units have been despatched to assist you, follow the suspect but maintain a safe distance. If you spook him he could switch into offroad mode increase his speed to 50km/hr and significantly endanger the public"
"base, rider has just looked over his shoulder and spotted us. He's wearing a fighter pilot helmet and a skull face mask. Dear god, I think it's Hyena!"
"keep it together 26, remember your training. Wait for backup then pull him over and measure his 20m acceleration time"