I started on my Elna 6001 years ago and moved up to the Handiquilter Sweet Sixteen which is still a sit down just turned 90 degrees from a smaller sewing machine. It's on a 3x3 foot table. I loved it because there was no learning curve since I had already been FMQ-ing on my Elna. To be honest the long-arms scare me!
Right now I am working on a king-sized Tennessee Waltz and it is performing like a champ. This is the second king-sized I have done along with a lot of lap/twin sized quilts since I got it 4 years ago.