Yup. Well, more likely I went to the bin of used spokes and they're all too long and I don't have the patience to order the right ones.
The problem that I've encountered is this: you twist the spokes together before you tension the wheel, so when you bring them up to tension you'll almost certainly end up with more tension on one side of the twist than the other. The overall tension may be right, but it will be too low in some places. As a result, the spoke will cycle in and out of tension as you ride, resulting in metal fatigue and (soon!) broken spokes. At least, that was my experience.