I've tried both the Extra & Limber.
The V15 Extra (47.5 degrees) is one of my favourite ESN rubbers. It has a good amount of speed, and I like the overall hardness of the top sheet and sponge. Blocking and counter looping is extremely easy and the returns are loaded with speed.
The only drawback I felt was the lesser spin generation on serves and on low power shots. Similar to what dominus7 has mentioned, sometimes on brush looping, I do feel the plastic ball slipping off.
The Limber (40 degrees), somewhat retains the speed. But the overall rubber has a more "dead" feel. Maybe you can call this a more linear feel? I'm not sure. But I just wished it was more lively. If I were to describe this rubber, it's something linear, highly reliable and with adequate speed. Its good, but not great.
The V15 Stiff (45 degrees), is a new recent release. I think Yogi might have tried it already.