I love my compact 450gpd.
It's 2 years old and membranes still produce 000 before my DI. ( 080 TDS water in my area)
Gives me about 800 litres in a 24 hour period, and goes into a static system in my garage with auto shut off.
For those wanting to save money on water costs they are better too, you get a higher pure - waste ratio, and just flush the membranes once a week, or before a fill up.
Plus to replace all my membranes and prefilters costs less than £100.
Got mine from Doug Atkinson at
www.daqua.co.ukWould recommend it very much.