DVerbarg
Platinum Member
The biggest advantage to 110 punchdown blocks, IMHO, over the 66 block is uniformity. Cat5 jacks are all 110 style (haven't seen any 66 style) and you can save roughly $15 to $20 on the cost of another tip for a punchdown tool if you only need the 110. Otherwise there does not seem to be any real functional advantage of one over the other.