I have demonstrated this joiner at shows, and to my students who want to frame their own art. As with all this type of joiner it is very "fiddly" to get the "V" nails onto the blocks. The "V" nails have to be peeled one at a time from a normal stack and placed on the block. Apart from that, it does the job as good as any other underpinner of this type, and has the ability of putting in 2 nails at a time.