Well, I'll agree with Sethmark, especially about the smaller rotational mass. That being the main reason I like aluminum alloy wheels. But I'll qualify it a bit. Cheap is cheap. Cheap aluminum rims are not as strong as forged aluminum rims but those strong aluminum rims are also heavy. Cheap steel rims are lighter than good steel rims but are still a bit heavier than even the cheap aluminum rims and not any stronger. As a matter of fact, I prefer even the cheap alloys over cheap steel rims. I've run cheap steel and, like Sethmark says, they're seldom round and if they are they come out of round easily. They bend and yes you can hammer them a bit but even a small dent can spring a leak and guess what? Hammering it may not help. 1 hit, it leaks less. 2 hits, it leaks even less but still leaks. 3 hits and it leaks as much as it did before we touched it with the hammer. Darn!. Repeat procedure with fewer hits. I guess the key was 2 hits. However, in this instance, we think even the cheap alloy rim would not have bent in the first place. And had the wheel been hit harder, the cheap steel would not get "fixed" by simply hammering it. I prefer the cheap aftermarket alloys for weight savings and being round compared to cheap steel rims. If I wreck one I'll use a spare. If I'll wreck 2, well, hopefully buddy will have a spare. If wrecking more than 1 rim on a trip becomes an issue or if I'm hundreds or thousands of miles from civilization, I'll put heavy-duty steel rims on and suffer with less power. Luckily for D1 there's not much choice, so for now I'll run the stock alloys. Once I need less backspacing, I'll get aftermarket rims and if cheap alloys will be available, I'll go for those. If not, well, what else can you do?
I just saw a nice set of bling aftermarket alloys for D2. And I was thinking, "hmmm. I wish I had a D2. I could have cheap round and relatively strong rims with less backspacing and less weight. If only I had a D2". But then I dismissed such horrific mind wanderings.
P.S. I hope people keep putting steelies on. It gives jokers like me a chance to buy aluminum rims cheaply. Go steel baby.