Yes they are cheap, but....
I just installed a kit in my new black side panels for my '08 XP. I did some homework on vent kits for XP's, weighing the pro's and con's of each different manufacturer's kits. I decided that I didn't want the large aluminum-framed vents, thinking that they would look "added-on". I wanted something more subtle, almost like a factory option. Plus.....I am cheap! So I purchased some of the ModRod vents, being somewhat suspicious of the quality of their product for (at the time) $75. I was very pleasently surprised. Nice vents! The plastic frames are actually machined, the vent material looks really durable, and they use what appears to be a "plastic-weld" technique to bond the screen to the backside of the frames. The shape of the vents fit the "facets" of the side panels really well, and once installed, really do look great. I've seen some guys just drill multiple large holes in the panels for the vents to breathe. I decided to cut my holes as large as the screen material itself, using a Roto-zip tool (great for stuff like this!). On some of the larger "spans" of screen material, I would leave a bridge of plastic behind it to help support the screen if it should get hit by sticks/branches etc. If I had any complaint, and I am being a little too anal, is that I don't like the rivets. That is the only thing that makes them look not factory, although short of plastic-welding them from the back-side, I'm not sure how your would install them otherwise. I'll be honest in saying that for the money, you can't go wrong. Great product!