The BRS do a good job, but you do need your own controller.
One Chris did not mention is the standalone Profilux. it is an excellent unit as well and if memory serves it allows for a lower min dosage than the LMIII. LMIII is min 10ml I believe. It warrants investigation to your choice imo as well.
LMI is considered as one of the best because they have a great track record from folks who have had them 5+ years, as long as you annually replace the tubing per the manufacturers recommendation.
The bubble doser has very economical replacement pumps (something like 15 bucks) if one ever fails.