I was recently in the market for a ro myself.
I decided you could buy a lot of used 600 for the price of the hobby. (which is what I did , plus I didn't want to out grow it next year.
Even nott having run it yet I can already see a few advantages to the hobby:
Less wiring=less money
Less plumbing=less money
Portability
Ability to process small runs easier
But, it will not give the performance of the 600
In reality, any water you can remove is fuel time and labor saved.
My opinion only
Good luck