Bendpak is a great brand.Lots of support for it direct from the Factory if you search on Garage Journal.Jeff is the guy to read.He is a Bendpak employee.
Your example linked is a very poor choice if you want to work underneath so I guess you are not planning to do that?Perhaps you have a ceiling height restriction?
An alternative you may find interesting has the mechanism under the ramps, not between them. That is a huge advantage.
Try this link to improve your P.K.?
Scissor Lift buying opportunity - The Garage Journal Board