I use a 16 gallon Northstar. Used it for 6 years. Pump is still solid. But the plastic valves and wand handle will only last a couple years if you store it in a non temperature controlled environment.
I've gone through two northstar wands; now replaced with a sturdier unit got off amazon. The valve for the boomless has been replaced once and the current one is stuck open so I ran a metal valve in line that fixed it. Also on my second on off switch.
If you need replacement parts, Northern Tool sells most everything they put on the sprayers and have been helpful and reasonable on price when I've called in for parts.
All that being said I am hard on stuff and it still works well.
The key to getting sprayers to last is to get every drop of water out of them before storing for the winter. Who made it doesn't matter - if it freezes with water in it, it's going to burst. I've had a Northern sprayer for about 15 years. I had a couple of the cutoff valves to freeze and break before I started being careful about it. The last couple of years I have started putting rv antifreeze in it and I haven't lost one lately.
The cutoffs are the weak link on the Northern, probably on all of them. I keep several on hand so I always have a replacement.