The controller is the weak link in a DCS cart. If you are running oversized tires on a lift, stock controllers are not a good idea.
Any of the sponsors should be able to help you out, just click on them and call if you don't see the info.
IMO, the stock controller is fine for an all stock cart, the only time you may need an upgrade is if you mod the cart with larger tires, rear seat etc.
Make sure your batteries always have a good charge.
just throwin' this out there if the stock controllers are known to have issues would it not be better to spend the money on a unit with a better track record. a few hundred dollars more now would assure a trouble free future and if one decided to add seats etc down the road the upgrade would be in place