Do you mean the likes of alloy gators? I've read some bad things about those too.
Depends what you are looking for, how precious you are about your alloys and where u have to park.
I have had a few sets of Alloygators on different cars and they have served their purpose well in the past. On normal painted / powder coated alloys they work perfectly and can blend in or be a bold statement depending on the colour chosen.
On Diamond Cut wheels they still protect the wheels from curb / rash damage BUT they are not without their drawbacks as they hold dirt and water along the outer edge and can slip/ move / rub on the polished edge, Although to be fair they NOW do state they are NOT designed for Diamond Cut wheels. I did not realise this/or they did not state this back when I originally put them on, but found out later.
I have had a set on my original 18 Diamond Cut wheels for 1.5 years... they certianly stopped a few close scrapes, however they do trap water and mark the outer edges which might increase the chance of lacquer damage.
I took the Gators off recently after 1.5 years as I changed tyres and wheels .. the edges were marked but could be mostly cleaned up, albeit still leaving some minor marks that a blind man would be pleased to see...
Heres a few pics....
On the car.... Alloygators hardly noticable in black.
From the side, u really need to look to see then. Made the tyres look meatier. I was actually pleased with them on. I only took them off as I changed wheels/tyres.
To remove Gators, tyres have to be deflated and then the small sealing plug which is glued into place removed. Outer edge then gently comes away from the tyre... This then reveals the trapped dirt etc which sits betweel the Diamond Cut finish and the Gator. Over time its this that will do the damage.
Gators removed and wheel wiped with just a cloth
Touch of Mothers to clean and polish
edge from muck.
After a good clean up.
In typical fashion, it started raining as I took a picture! ... all 4 together cleaned and sealed with wheel wax ready for winter , not perfect but by no means terrible or anywhere as bad as I have seen other wheels in!!
Wheel wax..
Jungle