Installation was fairly easy if you follow directions
346208
Arrived quick. Installation was fairly easy if you follow directions. Fit my 2007 Dodge Ram 3500 mega cab which was my biggest concern
11454
It was fairly easy to install.and works as listed.
4065357
Installed fairly easily - didn't have to change cables.  Might be nice to include some kind of instructions or visuals.  Local mechanic showed me the basics and I was able to get them on without too much trouble.
1768162
Simple installation, great unit for the price.
157667
So far so good.  Instructions for installing aren't the best, but got it figured out.
172473
Easy install.  A bit of trouble shooting involved, but probably saved myself $250 doing this myself.
3686732
it was easy to install but I had to make some adjustments in order for it to fully work.
635160
Nice screen protector- easy install if you take your time and are careful :)
1685193
Pretty easy to use after figuring out the instructions.
4205710
Works well, fairly easy to install, but does need an interface device if being connected to a TV with an optical audio output port.
1909482
Not the easiest install, but the part was as described and functions well
4719614
This is a very easy install. Follow the directions as in the video and you'll be done in less than 5 minutes!
3393076
A snap to install (if you read the instructions) and I works great.
3085055
Fairly easy to install.  Had a bit of trouble finding a good spot, where the wires wouldn't get tangled in anything, but that depends on the configuration of your vehicle under the hood.  The alarm is not very loud, but the dog hears it, which works for us.  Had to train myself not to arm it until my automatic headlights turn off; it is triggered by voltage variances (like when a thief opens the door and the dome light comes on).  Comes with window stickers, which might be a good deterrent in themselves. Good bang for the buck!
4903640
Easy install, fit perfect...some of the directions take mechanical intuition.
2624777
I installed this on a 2003 Sprinter.  It's pretty easy to do if you follow the instructions, and buy butyl tape and lap sealant.  Mine was not quite as pictured - the base flange is a bit wider on the sides to include tabs for an optional rain cover.  Out of the box, it wouldn't fit between the raised corrugations in my van's roof.  I have no plans to buy the rain cover, so I just trimmed  the extra flanges off.  I also cut a ring of 1/2" plywood so the included screws had something to bite into.

The fan does a great job of moving hot air up and out of the van.  It'll create a slight breeze with the windows cracked, enough to keep the dog safe on mildly hot days.  And if you leave the windows closed and the van heats up like an oven, the fan can cool it down to ambient in about thirty seconds.  The remote is a really nice feature - not only can I control it from the driver's seat, but it has a thermostat that displays inside temperature.  The vent can also be opened without running the fan, for passive circulation if you've got vents down low.
3531200
Relatively easy install; works fine so far, couple of months, user loves it!