I have the humble N1 which I am starting to regret buying
I have had my N1 for a little over 2 years now and I don't regret buying it for a second. At it's price point it was a much better product than the competition were offering.
there is never any improvements or updates on offer for this printer apart from Ideamaker
I have upgraded mine in a number of ways...
Bond Tech extruders
Capricorn PTFE filament guide tubes
Power supply and Electronics box fan quietening mods
Door hinge extenders
Plexiglas lid prop
Cold end 40mm Noctua fans
These were not Raise3D upgrades per se, but you can get all the info from this forum or just google it.
It is dual extruder but so difficult to use the two together than I now just use it as a single extruder
Dual printing has an extra learning curve and takes time to get right. You need to know what will work and you need to calibrate the N1 to accurately align both nozzles, but when you get it right the results can be excellent. I don't believe that competitive printers are any better in this regard.
If you need help with any N1 modifications, feel free to ask. There are a number of us on here that will be able to help you.