Simple enough to set up first time and if you can keep it stored somewhere without having to flat pack it again then it's a cinch.
I'm only carrying one mtb at the moment and it's fine. There is some lateral movement in the arms of the carrier which no amount of tightening will get rid of. I'm hoping this is normal and nothing to worry about.
it does the job - tbh its the only carrier ive ever used: I've no point of comparison and frankly I still miss my van but thats another story...
Excellent quality rack and fittings. A bit fiddly at first but fast to set up and remove when you get used to it. Looks the business in blue as well. This is not moving anywhere when you fit it! Pricey enough but should be worth it long term. Recommended.