I've used Gutterman thread and it's OK - i do like the color selection. My go-to thread is YLI glazed cotton, rarely tangles (& when it does, it's because my piece cut is too long - operator error
) It's really affordable when compared to Gutterman - A spool w/ 400 yds is less than $5. A spool w/ 1100 yds is less than $9. Compare price w/ similar yardage and you'll see.
Sadly, no where locally sells YLI, so I order it online from Rose Rushbrooke. When I order it from Rose, it usually goes out the day or next from when I place the order - It comes from Florida to Ohio in 3 or 4 days. Shipping is pretty reasonable, too.