I'm a fan of Glide thread. My machine runs beautifully with it. However, it does have a slight (and I think, unnoticeable) sheen that Maxilock doesn't have.

My sewing store recommended Innovatech Thread. I finally ran out of quilting thread and purchased 2 cones. I absolutely love it! Less lint and it does quilt like "butter"!

Yes, the Maxilock runs very well on my Gammill. (I do not use other brands of serger thread, only Maxi). I have heard that Pam Clarke uses serger thread (hope I am not spreading a rumor here). I have used Maxilock when quilting charity quilts because the cost of the serger thread is less than the thread I purchase for myself, such as King Tut.). I think most people that quilt charity quilts provide the thread like I do.

A cone of Innovatech Thread was included in the goody bag at a machine quilting class. It was the thread recommended by the instructor as frustration free. It looked great on the samples I saw. I haven't used it yet but the ones who used it in class liked it a lot. I am a thread junkie. I love thread.

I agree with ckcowl. I have used MaxiLock thread on my APQS for 21 years and have not had a problem with it. I have also used some more expensive brand of threads, and they broke for me, so I basically stick with the MaxiLock. But some machines might not accept it as mine does. My longarm is 21 years old, and I have quilted many quilts on it over the years.

Machinelady "Why would the speed of the longarm affect the maxi lock. The serger has a much higher speed or at least mine does, There is no way I could quilt at the speed that the serger runs."

I agree that the speed of a serger is much faster than the longarm but you are combining three, four, and sometimes five threads for a seam with the serger and that makes a very strong seam as opposed to only two threads on the longarm. As with everything it boils down to personal choice and that is why a question like this will get as many different opinions as there are quilters. Personally I would not use serger thread for quilting.

I did a search for stitches per minute on sergers, and most that I found topped out at about 1300 spm. My longarm sews at more than twice that at 3000 spm.

Wow
 

3000 spm / 10 spi = 300 inches per minute. Or 5 inches per second. That is laying down some thread.

When I bought my longarm the tech said to only use good thread. I've been using King Tut. No problems.

Serger thread is not strong enough. I used it once and I am still unquilting that queen size quilt. The stitches kept popping and creating toe catchers.