Coming from a Shaft Drive to a chain will take some maintenance.
If the Enertia Plus gets an O-ring Chain, the maintenance will be less than currently recommended.
If not, well you can change the chain to an O-ring, or you have to oil the chain every 200 miles or so.
A Shaft Drive is nice, but loses efficiency, something that needs to be optimized on Electric bikes for some time...at least till the batteries are much better...
How many miles do you ride a day? How wet and dusty is it where you ride? Those aspects will influence how often you clean and oil your chain too.
Gavin
Drive shafts have been used on motorcycles almost as long as there have been motorcycles. As an alternative to chain and belt drives, drive shafts offer relatively maintenance-free operation and long life. A disadvantage of shaft drive on a motorcycle is that gearing or a Hobson's joint or similar is needed to turn the power 90° from the shaft to the rear wheel, losing some power in the process. On the other hand, it is easier to protect the shaft linkages and drive gears from dust, sand and mud.
For a gas bike, the advantages overcome some loss of power...but for electrics, well you can't waste any power advantage currently. But hopefully soon...
Gavin
other than the chain, not much maintenance at all on the Brammo it seems.