Should I buy padded shorts for my Spinning cl?

I had bunion surgery back in May, so I stopped working out on my treadmill, and anything high-impact still hurts. However, I've got this STUBBORN 15 or so pounds left to lose (I've already lost 20, then maintained throughout the summer). I'm a university student, and I've signed up for spinning cles at the athletics center. I'm supposed to go four times a week, Monday through Thursday. Never done spinning before, and I hear it can really hurt your ... so should I buy padded shorts, ie. for cycling? I really don't want to wimp out on this one - it cost a lot for the cles, and I want to budge that last 15!