I have not tried the Horndady unit, but I had been using a Lee hand primer tool (it was cheap). After about a year, I broke the lever on it, As I already had the Lee shell holder set, I bought a second Lee tool. After about 6 months of heavy use, I broke the lever on it as well. So I have thrown the cheap POS away and just bought and recieved a new RCBS hand primer tool.
The replacement Lee units are only $15 (excluding the shell holder set) and the RCBS was just over $50, but after two failures of the Lee units I just got frustrated with the damn things breaking when I was in the middle of a batch of re-loads.
The RCBS tool looks and feels much stronger. I have not tried it out yet, but I have a batch of .308 to re-load this week-end, so I'll give it a go then. The RCBS unit has a universal shell holder so you do not need to buy a set of shell holders.