I've been using and testing two of Will's Timers for a few months now. I know they work really well with the dynam/jeti esc's. This is one that I tried it with http://www.dealextreme.com/details.dx/sku.4460. I really like the way they work with the Pheonex controllers but they cost more. I am using the pheonex on my p-40 and banshee with his timers. Just out of curiosity What motor,prop,battery, plane do you plan on using this setup on?

Jim I also am using Will Hubin's timer , I have 2 of them and it vary easy to use and adjust for speed, flight time and idle time. with a handy button to start.

Jim,
I know the Dynam is more than you need but if you look at the weight of the 2 , .88oz. for the dynam and .85oz. for the Mystery I would use the Dynam as the difference in weight is negligible and that controler is proven. Its about $1.00 more but at least you will know it will work the first time and Will is familiar with those so it will make it easier for him. Remember the biggest drawback if you order from dealexteme is it can take anywhere from 7-28 days to get to you. There are vendors on RCGroups.com that also sell these for a few dollars more with reasonable shipping charges if ou need one sooner.