It will be interesting to see if Bionicon successfully gets around Optibike's bottom bracket integrated motor patent(s). I've not yet downloaded and studied them. However, the majority of electric bike manufacturer's are mounting the motor in either the front or rear wheel hub, or remote of the bottom bracket somewhere in the frame.

This is the cleanest, stealthiest e-bike I've seen so far. I'm still waiting for the one which has a motor twice as powerful as this, which sits inside the bike, and the batteries are inside the frame somehow...

I know I've harped on these before. And I really don't mean to be negative. But after some experience, in my opinion a PRACTICAL "e-bike" must output 900W or more, with 500W being the absolute minimum AT ANY PRICE. Anything less interests me not at all.

@Anne_Ominous anything over 250w nominal power is not legal for road use the the EU, so for a European company to produce such a thing would be commercially suicidal.
What concerns me about this is that the price point is higher than the best regarded of the European motor kits, like heinzmann (which are hub motors, admittedly) ; and much higher than the Bafang crank motors/mid-drives.
Strange price point at which to enter the market with an untested product, so it had better be good! I also don't understand at all why, if they are selling this in part as a conversion kit, they expect the bike manufacturers to adapt their designs to fit this product. Why would they do that? Perhaps I have misunderstood? Proprietary battery ssytem too - for a crowd funded product??
Too much of a stretch for me, sorry.

250 w. is reasonable for a standard bicycle, as this is about the most anyone can put out for an hour.

I use an e-bike (which I converted from a hardtail MTB) to commute and also love to mountain bike (no motor). I've been thinking of converting my MTB so that I won't have to shuttle my bike up the mountain and this would be appealing because it's the most compact and stealthy mid-drive I've seen, but it's too weak and expensive.
Where I live (BC, Canada), e-bikes with 500W is allowed on the streets without insurance and 1500W with insurance under the 'Limited Speed Motorcycles' classification. Further, there is technically no limit for off-road. So, this definitely seem underpowered especially considering the intended use.
Also, there is no motor only package; their 'for makers' package includes a pretty tiny 292 Wh battery for 1750 EUR. I would imagine makers would like to source their own battery not just for the cost cutting but flexibility. On my e-bike, I spent about $200 on RC LiPo packs to create a 59.2V 10Ah (592Wh) battery pack. It would be really nice if you could buy their motor as 'plain' like hub motors.

This could pique my interest if it were real rather than a Kickstarter wet dream.

I have an 8FUN mid-drive 350W e-motor by BAFANG. I have this installed on a recumbent trike where it performs beautifully. This motor is neat and replaces the crankset of most bicycles - it is made to be retrofitted and comes with it's own cables and controller. I use a 14.5 A battery pack which would normally mount on the drink bottle mounts but I have it in a low slung carry bag. I use the motor in pedal assist mode and have a choice of 6 assist levels though that can be any where from 3 to 9 depending on what suits. There is a throttle which can be used as well as or instead of the assist mode. All info can be Googled under BAFANG. The 8FUN comes in many power ratings and battery sizes and is a very simple system to install. I am getting between 60 and 80 kms per charge at approx 4 of 6 assist.

Interesting bit of kit, but I do worry about the ergonomics of it. It looks like adding this to ones bike means moving the left pedal arm out further from the center which then means making the rider having to move the left foot out further and it that really a good thing health wise. I wonder - perhaps someone else can comment on this.
Also given the things a mountain bike is put through I am slightly apprehensive. I would want to be very sure that my e-bike not certainly could turn into an electric bike of the shocking sort.

I sure am glad I don't live in Europe,My bike would be illegal and unless the police had some way of monitoring it they would never know.....are we the only country with Mountains? Still 24v X 250w is Ok on the bottom bracket or mid drive If you have the 250w in each of 21 gearas.....but a hub drive with only 250w....would suck a lot!! Thank you Izykel,for the post I was just getting ready to but a Fat Crawler Tad from "Utah Trikes" & was wondering about adding a Bafang-8Fun to it......if you can do it...so can I