[Phil the drill]

Hi,
Anybody out there tried to fit one of of these?
I'm considering fitting one of these to the wife's Saracen step through (26" version). The kits seem to be a good price (on ebay), and I don't think I can persuade her to try another bike (in fact it's difficult enough to get her on that one...). Hoping that I can get her back into using it for short trips to town (3 miles each way, and pretty hilly). Can't justify spending much more as I'm not sure that the effort will succeed.....
Anybody with experience of using one of these units, your feedback will be much appreciated.
Cheers, Phil