Yep, that's pretty cool and definitly a step into the right direction.
But, the last time I wanted to use that service it failed for me:
I tried to replace the battery pack of the vacuum cleaner of my mom. The pack costs just a little more than the new vacuum cleaner. I replaced the cells from the pack for ~15€ and found nothing special inside the pack that would make it that expensive.
In my kitchen I have a heated drawer to keep stuff warm made by Siemens.
...
At the back of the drawer there is one part of plastic which holds the electric contact for the heating that connects when the drawer closes to the back of the device to power up the heating.
That plastic back broke. The spare part I could have bought from Siemens is the whole drawer for ~290€. I repaired the plastic part using reisin and silicon.
I used the service before successfully, but there is a lot room for improvement.
Yep, you should try, really! Together with silicon it makes a perfect couple to replace or repair broken plastic parts...