I've wanted a bobbin winder ever since I started spinning. You're supposed to rewind your bobbins, anyway, to even out the twist. Also, I never have quite enough bobbins. Even though the bobbin winder is expensive, storage bobbins aren't. So, once you've made the investment in the winder, you can make up for it the first time you want to use more than 2 more bobbins than you had before.
I didn't spring for the bobbin winder for a long time because I already had a ball winder. A ball winder can be used instead of a bobbin winder. Instead of little plastic bobbins, I just used toilet paper tubes that I cut to make a little thinner and taped together.
This works well enough, although it's not perfect. More than once, I've wound too enthusiastically and the whole thing has just lifted off from the ball winder. Much untangling and cursing ensued.
Then, I started weaving, and that pushed me into finally getting a bobbin winder. Why? I want to try a boat shuttle. In theory, you can wind a boat shuttle bobbin by hand. But, I didn't want to. I now had two whole excuses to get a bobbin winder.
1) It would, in theory, make my spinning better.
2) It could make weaving thin yarns faster and more fun.
I'm going to try my first sock-yarn scarf this weekend. I'll let you know how it goes.
Shouldn't you be spinning?
Yes. I'll do it tonight. :)