Yoder YS640 on competition trail?

Not real familiar with that model and have only done a couple of comps so I don't know about how many people are out there using them.

Did you already buy it then? If so go ahead and use it. As long as you are learning to cook with it you may as well.

I compete quite a bit, and yes there are a couple of teams that compete on Yoders out here in California and done fairly well.

My advise to you is that you can cook good food on anything, as long as you know your cooker and can achieve the desired tenderness the judges are looking for.  Practice, Practice, Practice, and when your family is sick of the food, practice some more and feed the neighbors.

This pretty much goes with any type of cooking, but the more you know the ins and outs of your cooker, the easier it will be to turn out great product.

Good Luck.