Storm,
Our local distributor has them listed for a price difference of about $45/head (List).
I would bet over time you will get that money back for not having to dig up the head (turn off water) for a quick pilot valve change. Also no chance of hitting solenoid wire when trimming around them (had guys go too deep with knife on an angle and cut the wire before). We just installed about 15 of the here and I am very pleased with them.
We did an irrigation expansion of 11 heads in house, it was nice to be able to put wire in trench, glue up pipe then just shove wire into heads while crew back filled trench (then I went back and made all electrical connections afterwards). Allowed the crew to not have to wait on me to make all connections, and they could keep working to finish faster!
i have yet to see any downside to them!
Here is a link to our local Chicago, IL distributors 2014 price list
http://www.reinders.com/golfirr/2014GolfIrrigList/torogolfsprinklers.pdf