According to friedcat Gen2 is not worthwhile for 2 reasons:
1) Gen2 would come out relatively late due to some factors outside of AM's control
2) Gen3 shows promising results and the roll-out seems to be better/more reliably organized

Thus funds are better to be spent on Gen3 hardware. The production schedule will depend on a risk/reward ratio determined by friedcat. Deviations from the schedule need to be anticipated when rolling out a new product technology, so hedge accordingly when speculating on AM.