My Tj started as a softop with half doors, then I purchased a hardtop, next logical step was the upper sliders. I got the fabric surrounded sliders discussed in this thread.
In the heaviest of down pous when parked at the wrong angle iget a little water around the seals - but less than I tend to get on the average outing so nothing that worrys me.
They are definately quieter and obviously more secure....and no zippers ..... can open at free way speed for a little extra air without the window "sucking" out. bit of a squeeze for drivethroughs & paying tolls - although the Tolls aren't an issue now we run electronic tags
Anyhow ened of the day I;ve been running them for over 2years now and would do it again any day!!