The flat Compline II is a little lower indiameter than the old Compline on the thinnest side. A little more"rectangular" shape. It has the same amount of stretch as the old version and is a little softer in the handling, especially whenused several days in a row. Because of the lower diameter, we recommend to use this line inslightly higher breaking strength than Compline. For instance, a 50 lbs Compline II will perform well with both 9/10 and 10/11 wt rods. The 42 lbs version works well with 8/9wt rods and can even be used on7/8 outfits. The 35lbs version lends itself very well to fishing with Switch and Single Hand rods. Being a bit more supple, this line has some advantages when it comes to stretching it and eliminating "dints" that have occurredwhen tangling. It stays straight in colder weather and is easy tostretch. The flatter and wider profile picks up a bit more waterresistance when casting, reducing distance a little compared withCompline, but it sure is marginal.