well i have a 97 Chevy S-10 Blazer with ifs and i've thought about changing it over to soild but all i do is mud in mine and even hitting my 3 ft deep ruts from the side my ifs has held up great all i've had go out is my ball joints and i'm as hard on mine as the next person i mean i wheel with a 84 ram charger and an 84 bronco and i go just as many places as they do with their soilds but that does not change the fact that soilds are like a million % better  

Once wheeled with a buddy of mine with a vacume system to engage the 4wd on a s-10 it was always having some kind of issue. Wasnt off road friendly. Vacume lines cracking all the time. Vacume systems suck on any vehicle.