I also have the refurbished SpectraPure 90 GPD. Excellent customer service, i've had to deal with them twice and both times they went above and beyond. My unit arrived with a broken john guest elbow fitting, but they got a replacement out to me in 2 days. The second time surprised me, but it's why I can so easily recommend them. I bought a 180 GPD membrane when I first started out, thinking there'd be no drawbacks and i'd get faster water production. I asked on RC why I was getting 10 TDS now before DI and SpectraPure said it's because I purchased a membrane designed for aquaponics, where super high rejection rates apparently aren't as critical. A rep PMed me and offered to take it back for full store credit which blew me away.