I started out very happy with these, but see updates at the end of the review.The hatch on my 2002 Grand Cherokee developed a nasty habit of falling on my head because the struts were starting to lose their lifting power. I bought two of these, and in about 20 minutes, the problem was solved. They have been installed for about a month, and seem to be working just fine.Installation was easy. The old struts were held by two bolts on each strut. Once they were removed, the new ones popped could be screwed in. You may have to hold the tailgate as far open as possible to install the strut.A couple tips from the installation:1. Get a helper. Much easier if someone holds up the tailgate while you are trying to replace these.2. You will need a Torx bit- not sure of the size, but it was the largest one in my kit.3. The existing bolts are on pretty tight. A drop of penetrating oil on the screw made it easier to remove the bolts.4. My Torx kit only had a cheap "screwdriver" handle to hold the Torx bits. I ended up destroying this handle because the existing screws were in so tight. It is probably worth buying a ratchet wrench setup before you start.5. One tip- when installing the new strut, it helps if you snug up the upper screw first. This slightly lifts the strut, making it easier to line up the bottom screw.Hope that helps. The whole process was actually pretty easy- if you can use a socket wrench, you can do this.UPDATE: 9/9/13After 7 months of relatively light use (I open the tailgate roughly 3 times per week), my opinion of these has gone from 5 to 1 star. They still work, but they make so much noise I am ashamed to open my tailgate within 100 yards of people. Opening or closing the gate will result in a very loud screech from both struts. Not an annoying little squeak, but a very lout, annoying, nails-on-a-chalkboard screech.I have tried a film of oil, silicon spray and creative language, but nothing will remove the screech.I finally tracked down the StrongArm supplier, AVM industries and left an email message on their customer service website.Update 9/24/13I guess after 2 weeks, they have no intention of replying to their emails. I called their tech support number 800-790-5438. No answer, but left message.Update 9/25/13Another phone call, another message. Still no answer back.Update 9/26/13I passed the Amazon 30 day window, and thought I was stuck. But I contacted Amazon customer service and told them my story. Within an hour I received a reply, and Amazon is taking them back and providing a refund.So, a happy ending, but I will never touch another product made by AVM Industries.Update 10/16/13Got my refund, less a 20% "restocking" fee. Chalk up $7.50 to "experience"And Finally-  10/18/13After contacting Amazon Customer Service again, the refunded my restocking fee.