Which gun models? About how many brads before the triggers went?
I have two of the 18ga Smart Point probably not more than 500 brads each, but no trouble so far.
Seth
Honestly I have no idea how many nails have been shot. Not as many as a production shop, since mine are mostly used for trimming, baseboard, crown, etc. Age is probably the bigger enemy of the o-ring seals.
I do like the Smart Point 18g I have and it does far better sinking nails than my older 15g. Triggers are a common failure on Bostitch guns but fortunately they take about 1 minute to change and cost under $15. Rebuild kits are little more, and it takes a little while to clean and rebuild one. Pretty simple design though. Bostitch was the leader for a long time for good reason, their guns work. My Bostitch floor stapler has never let me down, but I don't do flooring for anyone but myself and family.
Also bought a Ridgid framing nailer with a defective trigger, and post $10 repair it has served me well for years.
At a tool event I did get to play with the Makita Pinner and was impressed by it.