I may start to sound like a broken record on here, but I am seeing more and more benefits to the kind of approach embodied in the ShareRoller:
http://igg.me/at/shareroller/x/12713097 in spite of the fact that it is months away from being available and I have never even ridden a bike with one. But here are some advantages, as I see it, with the SR relative to a dedicated ebike:
1- Light weight. The entire system weighs from 5-8 pounds depending on how big a battery you get, and extra batteries would be easy to carry and swap in and out if you needed extreme range capabilities.
2-Because of the light weight, it should not overload a conventional bike. And when not needed, or when the battery runs out, or when a problem with the electric assist arises, you would still have a very ridable bike with or without the SR mounted. You could put this ShareRoller on a 25 pound or so bike and have one heck of a light weight ebike. Even a 35 pound bike with this added would be light compared to a 50-60 pound ebike.
3- No problem getting repairs for anything to do with the bicycle itself at a regular bike shop, and if the ShareRoller business model succeeds, it could be easy to send it back in for repairs, unlike shipping an entire bike back for repairs. You could even have two of them on hand to cover you if something goes wrong.
4-Capability to swap the ShareRoller among different bikes. You could have an expensive road bike for joy rides, a cheapo bike from Craigslist for running errands or short commutes where you need to lock it up outside, a mountain bike, a recumbent and even a tandem....and all of them could use the same SR.
5- Ability to remove the SR at any time and instantly have a normal bike.
6-Cost: You could have a very nice $1000 bicycle, a ShareRoller with a spare battery and still have spent less than $3000...a lot less if you preorder in the next few days.
This all depends on the performance of the device and the success of the business, but I am very eager to try one out. In the meantime, my wife and I are enjoying our Magnum Ui5's immensely, and yet part of me is glad that I did not spend $3000 and up on an ebike at this point in time. I want to see how some of the technology develops before I invest that much. If they turn out to be reliable, I could see the Magnum's being all of the ebike we would need, but I like exploring my options at the same time.
I am hoping to pick up a hybrid road bike I saw on Craigslist today. It is nothing special, but I want to have it on hand to be able to test the ShareRoller on a regular bike along with my idea of putting the ShareRoller on the front of my Magnum for a two wheel drive ebike that will easily tackle the hills around here. And besides, the bike is for sale for only $30, so if it is even rideable it will be a great deal
This way I will also have much more to report on when the ShareRoller I preordered arrives. And if I like the way the SR works on a regular bike, I can upgrade to something better later. Note added: the craigslist bike was a bust, but my brother in law is going to give me his Giant Cypress DX hybrid bike in March, so I will have a regular bike to try the ShareRoller on.