Do you remember what it was like when you were a kid and you finally got to ride your very own two-wheel bike without any training wheels? It takes far more skill to keep a bike with two wheels upright than it does to keep a bike with training wheels up. A new company is hoping you won't mind taking a step back and turning your bike into a 5-wheeler.
The StreetSurfer is hoping to become the next Razor Scooter. You know, those stupid scooters that too many people thought were cool for all of a couple months. Then they got smart and realized they were riding on a fucking scooter. This has two distinct differences from the Razor, it's not going to work right out of the box, you need a bike to attach it to, and it's going to cost you an arm and a leg.
How much would you pay for what appears to be the bottom of an RC car that you can attach to your bike? I'm going to guess that it's nowhere near $960 which is the going rate for these. I'm sure that there was plenty of R&D that went into these things, but seriously, it's four wheels that you attach to your bike.