well, i decided to bite the bullet like you did and bought it today to pair in conjunction with my ecco 2234 on my 29 gallon.
currently i'm running about 415 gph worth of flow throughout my tank, but with this i should hopefully be able to remove 2 of the power heads (red sea and a hagen mini elite originally used for co2) and replace it with this SunSun to come out a little over 550 gph. Not that i necessarily needed the flow aspect, i certainly don't have any problems with detritus. However, I've been looking for some redundancy in case something were to go wrong with my ecco.
I do have another ecco 2234 sitting around here, but i was in need of parts that are always out of stock and have no known time of being ordered/received.. or highly priced. Soooo, this came out to be a cheaper and overall better option.
Thanks for taking the time for the review and i'll post what results I have after I've received my SunSun.
click above for my tank journal - Eheim Pimp Club #357 - SunSun Pimp #3