IMO, the Malvern does not fit TTS. I had to size up half a size to get a good fit in the toe box. The rubber sole is very well done and does not detract from the look of the shoe. The only negative I would have about the soe is that I had to send back the first pair of Malverns I got due to the rubber heel covering coming loose. I've had them about a year now, and the same issue is happening to the second pair.
I don't own them, but they were on my short list as a consideration when I was looking for a rubber soled boot last fall. I ended up going with something different. However, I know that many people have had trouble with the fit with the Malvern, saying that it doesn't fit the same as the other 1-511 Last shoes. I think the padded insole was where the blame was eventually pinned. As for the sole, I think it works just fine as long as you want a rubber sole (it is actually AE's imitation of a Dainite sole), and has a clean profile.