They are pretty close. I bought a Typhoon II from airwaterice.com 8 or nine years ago. I've replaced the membrane once and the other filters as needed. It's a quality filter with clear housings so I can see when the the sediment filter is getting dirty and when the DI
resin is starting to be exhausted.
It'a also a 5 stage filter consisting of:
10 micron sediment filter
5 micron charcoal filter
1 micron charcoal filter
Filtec 150 gpd membrane (98% TDS
Color changing DI
The unit also has a pressure guage and flush bypass.