The problem is, they currently don't ship to North America.
Yes, I have a positive experience with the site and with one of their products (VolSpeed V2 for Giant). On request, they will send you a User Manual by e-mail and answer your questions in advance.
The chips listed on the website actually work very well. After installing the VolSpeed (which was painful process -- more on this later), the chip is activated by a sequence of keys on the bike's remote and the bike becomes de-restricted until the motor has been switched off. The displayed speed, distance, and odo values are correct. (You cannot set the wheel size, however, as that variable is protected by the manufacturer and is read-only unless you are the LBS). The experience is quite exhilarating: at the cost of more battery charge used, I could achieve over 40 km/h on my Trance E+, and other people riding my bike could get well over 50.
The pain is in the installation process. In case of PearTune, they write "remove the motor cover" but I am not sure how easy that is. In the case of VolSpeed V2, it was clearly specified what tools were necessary, and the User Manual detailed the procedure down to an iota. Yet, it was necessary to dismantle half of the bike and then it turned out it was very hard to find some spare space to fit the chip inside the bike and to fit all the wires/connectors back inside the motor chamber. It was a complicated work.
Things might be easier with the SL, not sure. Getting the User Manual helps.
Still, they don't ship to Canada.