Kris Keifer of Dirt Rider/PulpMX fame did a lot of early testing for this bike.  I would love to ride one and see what it is like!  The price is a bit steep at $15k but that will come down with time as well.

The 2017 Alta Redshift MX may be a high-end, high-tech electric dirt bike, but it’s not afraid to get down and dirty. I know this because I crashed a brand new one on a Florida motocross track, and it didn’t even flinch. Actually, it didn’t even stall. I could get used to this “electric dirt bike” thing.

Source: http://lanesplitter.jalopnik.com/this-motorcycle-sold-me-on-electric-dirt-bikes-1793462558