I've always been able to light tinder with one eventually, but in any sort of wind, I collect the shavings in a container like a folded scrap of paper. Once I've got enough to make a pile about the size of 3-4 stacked nickels, it takes me 2-5 sparks to get the pile lit. I haven't tried the new-to-me advice of holding the scraper/knife still and scraping the bar across it instead of moving the scaper across the bar. But I can definately get tinder lit without too much trouble.

Then things usually go bad because I usually don't collect enough tinder and twigs to sustain it. I like the advice of collecting what you think you need, then doubling it. In my case I should probably triple it.

Watching video of guys like Les Stroud and Ron Hood, one thing I haven't done is blow a lot of extra oxygen into my tinder pile to get it really going. I usually start puffing at it when it's too late.