I have the BlockRockit on a Grace GMQ Pro frame and I love it. I quilt only for myself and do not need a extra large quilting machine. I think the larger machines may be for those who quilt for others or do extensive machine quilting. The BlockRockit is easy to use and is made simply enough that you can do your own maintenance. The lighting is great and the stitch regulator is easy to use and you can't beat the customer service. I do have a lot of tension problems but I hear from owners of all types of machines, that tension problems are usual. I suggest you join the Blockrockit yahoo group. They have a data base of where their machine owners live. The owners on the database make their machines available to those who may want to try it before they buy. Feel free to pm me if you have any questions and I will try to answer them.