I'm a bit mixed, Hulley.. here are some random thoughts on them:
I'm NOT happy that I've had to go through so many repairs with them.
I AM happy that their customer support is incredible and quickly fixes things for free (and will even send you replacements first, for free, if you ask nicely

). (The amount of repairs have dramatically decreased, and the first unit I bought from them in August 06 hasnt given me any issues for 6 months.
At first, I loved them, then became unimpressed when I still couldnt kill ALL of the detritus in my tank desipte having 3 going full blast.
Now, I am happy again, because of the new rock layout/starboard bevels / setup, I no longer have those detritus piles.
If i had swapped them out for Tunzes early on, I wouldnt now be loving them again for their incredibly small footprint and future controllability.
So, there you have it
Then again, you have a 180, so you have more space.Tunze/Stream style pumps dont look as horrible in bigger tanks, but in my 90g, they stick out!