The molding clips eliminates the need for a helper, but if you want to "dry fit" a piece of crown before nailing, such as a coped inside corner while checking finished length, then the clips need to be removed, thus defeating the purpose.
I did however complete my living room without a helper, but had to nail the crown, remove the clips and then un-nail it to adjust length or fit. Overall, worth the 6-bucks!
Get more detail about FastCap Crown Molding Clip, 4-Pack.
