[DonRotolo]

Used properly (and every container of these - bag or box - MUST contain proper usage instructions) wire nuts are as good as just about anything. And they're available in sizes for almost anything you'd use on a robot. For big (>10 ga) or small (<20 ga) they are not optimal.

That being said, we don't use them, since we try to avoid splices and wire nuts are not better than a proper solder connection. For connections that need to come apart, we use connectors.