Looking at getting an uppy downy post. I've got a Joplin 3 but, like most people it seems, I've had problems with it. So, is the Joplin 4 still prone to side to side waggle and problems with seals and valves?
They can be had damn cheap but I'd rather pay more for something that will work and keep working.
If the Joplin's a no-no, what's the most reliable post out there?

