I love my March pump. I've had it for a few years, and I abuse it, and it keeps on going (so far). I use it for mash and cooling recirc.
I do wish I could take it apart more easily and clean it. TC connections would be great, but so far I haven't had any problems cleaning it via CIP after a brewday.
I brew 5-10 gallon batches, so I don't really need the larger impeller (I don't use full flow except for cooling recirc). I don't use a grant on my mash tun, so I figured the additional suction would further compact my grain bed.