i bought a nova from ebay. so far i've changed the seat because the one that it ships with is torture. i was going to get a thudbuster, but i found an old spring seat, so i slapped that on. i did have to order a new seat stem pipe because i broke an allen key off in the bolt of the one that came with the nova. thats ok, because the one i ordered is shorter, so it doesn't stick out the bottom when i fold it up
i also added a planet bike computer, i was able to get the bike up to 23.3mph . i think the gearing is too low, i'd like to go faster and pedal less so, i ordered an 11-28T rear freewheel from itselectric.ca they are hard to find, i ordered it on may 1st, it shipped today...
if the freewheel is not enough, i will change the front cranks to something with more teeth. i think i have an extra crank from an old bike that might fit. then there is always the possibility of a front derailluier
but, without the mods, the bike is solid and worth the price. i ride it everyday for about 3-10 miles