I wouldn't notice the weight. I don't like how they rattle & vibrate, though; I haven't had a kickstand that didn't make a racket when the bumps were big enough.

They're great for parking the bike where you know it's safe, like in the backyard, lined up in the garage, etc. Pretty much anywhere I take my bike, though, it's either going to be locked up (which keeps it upright), leaning against a spare wall (at work and at home), or just lying on the grass (picnics, bike meets, etc). The times when I'd actually need a kickstand are far outnumbered by the times when it'd just be an extra thing to bounce around.