agree,
seems like a good inexspensive purchase to me, would be interested to hear how you get on with it ie; your product tds should be pretty good as you've quite soft water supply and its pumped, wonder how quickly you will fill your tank.
I used to have a merlin but had this have been an option at the time I'd have gone for one of these, especially as it appears to come with all connections and a tds meter. However, I now have a 4040 because I could justify the expense in my case.