I've been using one for years on my small format systems. It's ok. Enlarging lenses are super low contrast and aren't coated to protect against lens flare. Mine will show flare if any direct sunlight comes close to hitting it. The tilt function flops around so it's not easy to hold from shot to shot. And the lack of wide angle makes it of limited use. I've pretty much traded mine in for the Canon 24mm tilt-shift.
John