Left on previous model: I was torn between the Yamaha and Bosch drive after reading the reviews, tested both and to my surprise I preferred the Bosch, Martin gave me a wide choice however after he pointed out the value of the FS 900 with the higher spec I chose it as I knew I would ride it a lot.
It is used for a 15 mile commute daily and kept in Sport mode, lunch times I use it on a local single track path down a large hill to the beach for lunch, it flies back up again, the battery lasts all day and I am averaging 17mph! I get to work in the same time as a car and get some exercise without feeling too tired.
I would recommend the derestrict kit and go for the larger front cog (seen 34mph so far!) together with Super Sam tyres for speed and still be useable off road. Dropper seat post is a must too.
Really happy with my purchase, Martins after sale support has been fantastic too.