I had BOS suspension on my Tracer 2. Devilles to start with and then bought the VIP'r at a later date.
The devilles were excellent, lovely forks. The VIP'r was very disappointing. Straight out of the box it made a horrible clicking noise when in use, on the soft setting. The hard setting made a very hollow knock when taking any sort of impact, I only noticed when I forgot to switch from hard to soft on a descent. The shock went to Frane and was returned apparently working, minus the mounts which they had forgotten to put back in. Installed it on the bike and it was exactly the same. More emails between France and I and they wouldn't sort it so I got rid, they say it worked fine an it was the air passing between chambers. No other vip'r I've seen does the same!
I went back to a RP23 and I prefer it as a rear shock. I also sold the devilles and got some 2013 float 36 which I think, after tinkering, are very close to the devilles. Having held devilles in one hand and fox in the other, they definatley aren't lighter. I suspect they weigh them without any oil in (BOS) as opposed to fox who just ship them without oil!
If they work they're ace, if they don't you're buggered!