Had a PBL before the HF lift ... It worked but okay for a while but it was klunky, it doesn't work for head removal, wheels are too small and the cylinder only lasted about two years before it went bad. Wrote it off as a bad job.
Lucked out on the $160 price.
Saw they were on sale and went to get it.
Got to chatting with the manager mentioning I was going to use it for pinball machines.
He smiled and started reminiscing about them in his youth.
Listened intently asking him about the old days and if he remember titles and such.
It helped - we clicked.
When he helped me up to the register with it and told the gal to scan the 25% off coupon for me too (which normally doesn't happen for item's already on sale).
Maybe give that technique a try ... can't hurt.
Anyway, got it home, pumped it up and next morning found it all the way down.
Alas, the cylinder was faulty and had to return it for another (which works fine).
So when you get it home pump it up and see how it is in the morning.
They normally will creep down a very little bit overnight ... maybe an inch or less but again it's normal for them (confirmed by others that have them too).
Don't attach the hardware right away in case you need to return it. You'll just have to take it all off again like I did (grrr).
You should not have to fill/top-off the oil even though the instructions say to do so.
"Try it - You'll like it" (and wonder how you got along without one ... = )