How about a serious question for a big change. Can you share ( even though it's just a roller ) pros and cons over the xr you've driven the last year? I've only been a berg guy so perhaps it will help someone make up their minds to make the switch. Even if it's just from a building / maintance point of view.
As some one who has had both and driven both for well over a year I can chime in.
Berg pros:
-Strength- in very extreme binds you have the confidence that you can power through it(way more then the xr liked)
-Servo location
-Battery being up and out of the rocks
-Maintanence is a lot easier, I've shaved the front bolt so the gear box has 3 bolts to split the gearbox
-Great vendor support
Berg cons:
-Lack of ready available cvds
-Alloy casing, depending on rock type can not slide as easy as plastic( these being delrin will stop that)
-You have to learn to watch for front pumpkin position with some lines( some times the xr had no issues)
-Need a lot of modification for optimal preformance( turning tubes,moding gearbox so servo will fit into location.
-Pinion gears
-tie rod location
Xr pros:
-Plastic housing slide great on most rock surfaces
-The under side shape is minimal and you don't need to worry to much about hanging up on the pumpkin.
-tie rod location
-when building nothing needs moding for the axles to be assembled.
-compact gearbox.more room for electrics on the axle.
Xr cons:
-maintanance , a lot of screws/bolts to split to get into gears
- no a lot of vendor support, axial and vp had the monopoly for the parts
- while still strong, not as strong as my berg. I broke more xr parts then berg.
-Servo location,servo horn always hangs down in the way
-battery on the axle,always in the rocks
I didn't mention cost, building a set of either from scratch with all new parts is a similar cost.
Some might not agree on some points made. Personally I like the alloy tubes, gearboxes and offset pumpkin. I also like my tie rod in front and above the gear box.