While the Model 98 Custom isn't a great tournament level marker, it can be upgraded to be suitable. Upgrading from the single trigger to the double trigger increases the rate of fire about two-fold. I would only recommend this upgrade if you are planning on playing speedball. However, there are a few downsides. The trigger is Quite expensive, for about $.20 of plastic. And speaking of plastic, the triggers made of it, which doesn't provide for the best durability, but then again, how much beating will your trigger take.
Increases your fire rate, yet expensive. The trigger is a great addition, but don't waste your money unless you plan on playing a lot of speedball.