Calcium reactor: Looking for experience/recommendations

Title says it all: Looking for experience with an Aqua Excel Calcium Reactor CR50 w/ Sicce Syncra 2.0

Or to see if any have other recommendations. I'm looking for new, not used. Going for 250g+

Was considering a Reef Octpopus 8" Single Chamber as well, but I just feel they are a little over-priced.

Or if someone has other recommendations as well. I'm open minded.