Actually, if it is done by someone who knows what they are doing, it is a good inexpensive way to lower a vehicle. I had it done to a 68 Fairlane 500 within 6 months from the time I bought it new. It was done with the springs in the car. The whole spring is not heated, only near the bottom and when that area gets hot enough to lose its spring rate, it just lays down and the heat is spiraled along the bottom until you get the ride height you want. Those coils just lay on each other. The rest of the spring still maintains its spring rate. The real trick is to get it equal on both sides. I watched from the front while the guy was doing it and when it looked level, side to side, I told him to stop. We then measured it to be sure and it was perfect.
I only lowered the front about two inches and it had little effect on the ride of the car. I just had to be a little more careful going through big dips because it would bottom out easier. I drove that car with those heated spring for 6 years and never had a problem with them. I had it aligned right after lowering it and a couple more times while I had it. The front tires wore very well and the alignment held well. The rear tires didn't wear so well because I loved to drive that car sideways (I guess they call it drifting now). The car handled much better after lowering the front. That era of cars stock ride height was too high back then.
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