For me it just came straight down to price. I knew I needed two powerful powerheads so I needed to spend some major dollars. It was much cheaper for me to buy two 6105s than two MP40s. That savings was put into other expensive gadgets (controller, dosing station, etc..). Sure they are not as pretty as the mp40s but at 3434 gph (each), they get the job done and everyone is happy, including the bank account. I'm still very curious about the mp40s and I'm sure the are awesome, but I got what my budget could afford me at the time without too many compromises. 1 brand new tunze 6105 and one used one. Oh, and they both had the benefit of plugging into my profilux controller giving me programmable settings for each powerhead.
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