I used to have what appears to be the earlier rendition of that pump but looks like that one now has a stainless head. the impeller looks the same though and I had major problems with that breaking. Surely if they are still selling that pump they have fixed the problem (?). Makes me want to dig it back out and replace the head and the impeller and see if it works.
Anyway, you will definitely want to have a 1" port on your kettle (it can feed back into a half inch) or it won't work. It has to have that higher flow rate or you will have all kinds of problems.
That said, no problems on even a 35 gallon batch getting a WP on my regular old March pumps.