I purchased the Jet 14SFX last month and I have had the same initial findings. I too setup the bandsaw saw and used the snodgrass method to tune. The overall quality was poor from the factory. Lowering or increasing the blade height adjustment is sloppy and has enough play to where I have to make an adjustments to all upper bearing guides. The lower wheel and motor pulley were misaligned. This led to the quick deterioration on the v-belt which came off the pulleys after about a week and half use.
Dealing with Jet support was extremely frustrating. I went through their endless hoops just to prove to them what the issue was. In the end they sent me another belt, but the wrong size. I called them back and they insisted that the belt fits and there was a 3rd pulley I needed to put around it. I sent them a at the anatomy on of lower components where there was no 3rd pulley. As well as the exploded diagram of the bandsaw in the manual. Also sent them photos of the original v-belt with the correct size and what size belt it stated in the manual.
I am too far about hour and half to the closest Jet Service Center. I wish I had this information before I bought it. Or really I wish I could just return it and spent the extra $100 for the Laguna.
In the end I bought a link belt on Amazon just to get back up running.