yes, i compete with two 22's, and they work well. there are drawbacks however.
IMHO, if you can afford the chubby G2 i'd go that direction. your life will be alot simpler.
consider this, you WILL need to refuel if cooking overnight or all day even. i use the "hotbox" method. prevents ash kickup on the food and gives you complete access to the charcoal ring and fire. HOWEVER, lifting the large barrell and lid with 2-3 gallons in the water pan and 30 pounds of meat is a chore. prolly about as heavy as a chubby anyway.
also, it'll prolly be almost two bags of charcoal per cook. knickels and dimes in the big picture, but that gets annoying long term....A)the amount of charcoal i need to bring to a contest and cost, and B)every practice is two farkin bags. that adds up.
with all that said, they can put out as good a product as anything out there.