If I buy a new Ping driver, can I switch back to the starter driver if I hate the new one?
Yes. Of course. You just pull that sucker out of your bag (or have your caddie do it) and replace it with your trusty ol' WGT driver. Look under "Edit my Clubs".
If you hate your new driver, you can either click edit clubs and you would have a different driver. But if you sold your old driver, you can sell your new driver back to the proshop and buy a new one.