I use lots of different threads on my Viking Diamond Deluxe, it has no problem with any. I even managed to get it to emb FSL using serger threads, I just changed my needle, doubled my WSS and slowed my machine down. Not all FSL designs need to be shinny, like things for my grandkids, etc. It works great once I figured it out. I rarely use my 4x4 hoop and have only started using my 5x7 since Viking came out with the magnetic one, its so easy. I will usually find several things to do at once and then use a large hoop.