Russell
Whilst the Q100 is only 9600 BTU compared with the Q200/220 with 12000 BTU both provide enough heat to direct grill and indirect roast on.
I have done a comparison cook on the Q100, Q200, Q300, Spirit & Genesis cooking a piece of porterhouse steak equal thickness and size. All cooked for the same length of time and turned at the same time. All were about the same degree of doneness, all were moist with good sear marks though the sear marks on the second side of the steak cooked on the Q100 were a little lighter in colour indicating that the steak absorbed more of the latent heat from the grill and the Q100 was not able to keep the heat up as well as the Q200/220.
Having said that, I demonstrate cooking on the Q100 with ease.
The drawback with the Q100 is the amount of cooking area. It is designed for 2 to 4 people and you are limited by the height.
You can easily set the Q100 up to cook indirectly however you are limited by area and height restrictions.
For $65 I would buy one anyway.
If you can buy the Q120 it is better. The side tables give you a good work surface.
Both the Q100/120 and Q200/220 can be used without a stand, there is not a lot of heat under the BBQ, however, I would ensure that it was sitting on a non-flammable surface that could withstand some heat.
I trust that this helps.
Regards