The flow rate is adjustable without the controller. You can buy the back up battery just incase of power outage. As far as the wireless controller may be questionable for those who using Eballast, aqua controller unit or anything that use frequencies. I was going to buy the vortech with the back-up battery. But after inspecting the product, i am not happy with the quality. so i decided to buy the generator instead

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I agree with the statement above regarding the placement of the pump inside the tank. It doesn't look nice with a big black thing hanging inside of the tank. But that big black thing kick some serious butt IMO.
If you have a tank like mine, you don't have to worry about that big black thing on the back wall. I have 6 pieces of tunze running inside of my tank and it is not an eyesore at all (May be i got used to it or i just lies to myself

) with 2" of wave i have in the tank, i don't mine if it is bulky. I have 2 wavebox, 2 tunze 6200, 2 tunze 6100 and soon i will add 4 tunze 6055. My personal opinion you can't go wrong with Tunze....

. It has great customer service, good reputation for years.
BTW, even my return pump is from Tunze

so..... It is up to you brother man. Pick what you like.......
