Setup: MK3S Revo Six hotend

Hey y'all! I'm considering upgrading my mk3s to Mk3.5s and at the same time adding a MMU to my setup. As budget is tight I checked on the big Chinese retail.website for mmu kits and stumbled across a set mmu3 plus prusabox by bluerolls for a pretty attractive price.. on the other hand as I'm quite new to the game I'm a bit on the blue if this would be a sound investment or if bluerolls lacks quality and is therefore rather cheap than inexpensive..

Has anyone made experiences with the bluerolls mmu kit and/or their Prusabox?

Happy printing !!