I bought mine from
http://www.topsonline.com in '07. It's still holding up strong five and a half years later.
As for the issue with the super slowness. Could be a bevy of things. A failing pump, clog in the system, failing hydraulic rams, issues with the wiring, failing power top amp, etc. If you had to top off the system, I would check for leaks. In the 9 years I've had my vert, I've never had to add any fluid to the top pump.