Not opposed to trying aquapel, but unlike many of the posts I see here I've never had issues with Rain-x. Then again, I don't just simply wipe it on.
I've driven 400+miles in a driving rain and never once turned the wipers on doing 75mph...and I garuntee I could have went further. Did its effectiveness wain? Some, but not enough that I still couldn't drive without using the wipers.
I always clean the glass with washer fluid from the station when I'm on the road, use their blue paper towels to dry it. I do this twice. Once I'm done I take dry towels and re-wipe the window one last time. I then apply rain -x and let it haze up good (it's usually not dry at this point). When it hazes up good I apply a second coat and let it haze as well, but I don't (ever) try and wipe it off. I simply take a hose, or if I'm at a station I use a bottle of water, and I simply pour the water (per the old directions at least)over the window. Once I do that I simply dry the window. It lasts a super long time this way.
I imagine aquapel could be used in like manner, maybe.
With the rain-x I've seen too many people try and wipe off the haze, which takes forever and a day. So, leave it there and simply re-coat it and pour on the water and then dry. It's super easy to dry and no smudges.
I used this same technique for 13 years on snow plow trucks in the winter time. Yes, windows got dirty. However, if you've ever plowed snow for a living on the "big" roads and had to chop and beat at ice build-up, then you'll know what I mean. It's a pain keeping windows free of ice. After every night/day out, my truck windows, wiper arms, mirrors front and back, along with the paint in the defrost area...it all got rain-x applied...and when the ice built on the windows and wiper arms and got heavy enough on its own to break itself, it simply broke itself free and slipped right off of the truck while going down the road.
I'll try aquapel sometime, but I don't expect to see much difference. Rain-X can be bought virtually anywhere, and with the proper installation I've never had an issue with it...except for when I didn't utilize the above installation technique.