I'm currently using an Orbiter 1.5 and it's pretty decent but I'm looking for an upgrade. I like the light style extruder sitting on the gantry over a Bowden system as it allows for flexible filament and has much better control over retraction.
Is the 2.0 a significant improvement over the 1.5? Should I get a new hotend as well with it?
Right now I'm using a MicroSwiss all metal hotend and am quite satisfied with it.
Nope, it is not significant. The only thing that really stands out is the runout sensor with loading function function that is sold for 2.0, if you dont need that, print ninjaflex 24/7 and your 1.5 has no direct issues there is no need to upgrade.
What about the filament feed path? I have a 1.5 and the only thing about it is that I have to hand feed filament changed because of the space in the path between the gear and the bottom going towards the hotend