I bought three Italian packages this year and put them in mediums with different frame types -- already drawn frames which I extracted last year; new white plastic frames from Mann Lake, and a mix of foundationless and pre-drawn frames. I found that the package on white plastic drew out quickly (more quickly than divides on Rite-Cell did) and performed nearly as well as the package on pre-drawn frames. They did build an unusual amount of burr comb on the white plastic frames. The frames seem like they may be susceptible to damage from excessive grasping pressure with a frame grip, but otherwise seem to be at least as durable as wooden frames with Rite-Cell. As Michael Bush observed, the white plastic frames have a smaller cell size than Rite-Cell. I do not know if it is small enough to reduce mite populations (I'm hoping to do sugar rolls on the pre-built and white plastic colonies this fall to find out). They are also very slightly narrower than wooden frames from Mann Lake, which leaves a little bit more slack space in a 10-frame box; I find this to be convenient. I used to try to keep the frames evenly spaced, but have recently switched to packing them all toward the bees' favorite side of the box. This makes it easier to find slack when pulling frames, and they don't seem to want to build brace comb in the larger gap.