Can't comment on durability yet, I just converted mine a few weeks ago. The roller boots might be beefed up in those high wear areas with wear pads and such.
Just a word of caution on fit - if the roller boots are built and sized like the ice boots (I have no reason to believe they aren't) - expect to go down at least a 1/2 size from your normal skates, they will likely feel too short at first, but as they break in, they give quite a bit. And make sure the shop bakes them prior to try-on, or you won't get an accurate idea of sizing. For example - I was in Graf size 5 and CCM size 4.5 with just about a perfect fit. CCM and Bauer/Mission should be about the same sizing. I ended up in True size 4 and have often debated whether I could go down to a 3.5. The 1 piece boot and extreme moldability of their materials and construction make them pretty different from just about anything else out there.