It's nice, but not exempt from flaws. Mine has been up and running for 2mi and I'd say that it hasn't done much for me but give me piece of mind.
The good:
1. Nice to be able to spend less time testing, but if your tank has been up and running for a while you probably have it down anyways.
2. You can't get any easier for changing and repriming the lines, just run the replace reagent task.
3. It's a miracle that this tiny intake line hasn't gotten clogged yet.
The bad:
1. Reagents are difficult to find and you'll never find the 6mo kits which seems to just be a marketing gimmick.
2. Reagents don't always run out evenly during normal testing leaving you to toss several days worth of tests because there is no way to replace B and C without doing A.
3. My biggest pet peeve is this does not, let me repeat, does not stabilize dosing according to your desired levels when using their DOS system. I run triton and have alk set to 8.0 and it recently dosed up to 8.4. what the heck? (I like how my acronym is modified and expanded automagically). I end up having to turn my dosing off for several hours to stabilize when it goes haywire.
4. Once it gets down to 6 tests left it seems to stop, that's 3 days down the drain.
5. When it claims that it's out, it just flashes on the dashboard. One would think it would send a message automatically, guess you have to figure that out yourself.