Line Speed

I'm not a fan of having to leave it overnight, but I knew that was necessary when I purchased. Other than that, it works well. It does seem to leave less of the residue than other products.

I wish it could stay longer on the line

I used the line cleaning tool and cleaner solution on two lines that I will be replacing after the trout season is over. So, this was a pretty stiff test as both lines were in rough shape.
The line cleaning tool is easy to hold and made it quite easy to apply the cleaning solution to the line. After drying overnight (as instructed), I buffed both lines with a cotton rag.
Several drops of the cleaner were enough to treat each line. I would expect this will last for quite some time.
Both lines showed marked improvement in sliding through the guides making it possible to shoot more line for long casts. After 2 ½ months both lines continued to perform well. Given that both of the lines were old and facing retirement, the line cleaning kit did a remarkable job of revitalizing the lines. I would highly recommend the kit.