To my knowledge, none of the home\hobbyist lifts sold today are "certified". The price more than doubles when stepping up to a certified lift.

If binding with this design was a concern, you'd think this wouldn't be possible.

https://advantagelifts.us/image/data...slide_0510.jpg

I have yet to find a bad review on lifts of this design and there are a lot of them out there.

I laughed out loud at that... :D

Direct Lifts are certified. Don’t be mislead by these guys selling non certified lifts. They are not certified for a reason....

This lift is certified:

https://www.derekweaver.com/rodders-...d-4-post-lift/

Don

Lock notches are also integrated into the posts which limits your ability to level it. Looking at this design it is a cost reduced version of other lifts. I don’t understand how they can be charging a premium price for this lift....

Don

Lifts
 

Lance,
The only thing with a post tension slab (I have one at my house)
is you need to scan the floor for the cables and then drill in areas where
they are not running through... not a big deal unless you hit one
The one drilling will know if they are hitting something in the slab
and can stop right away but the scanning should tell you where

Bob

Local Direct Lift (among several other lifts he carries) distributor balked at installing a two post on a slab already poured. Said he'd sell me a two post, but won't install it. He's working on a quote for me on a 4 post to fit my needs.

Will chase the floor scanning option a bit more tomorrow if I get time.

I'm in the midst of my first real fab job on my new 4 post drive on lift and I had to share this picture.

https://photos.smugmug.com/1985-Mont...3_115735-L.jpg

What you see there is Barney on the lift ramps with one bridge jack holding the frame up right behind the rear tires and another bridge jack under the front suspension compressing it to full compression (springs out).

I'm installing a new weld in front sway bar and needed to have the frame at ride height and be able to completely flex the front suspension to check for bind. The 4 post lift and bridge jacks made this pretty easy to do. It would not be nearly as easy on a 2 post lift.

Overall I like the lift so far. I've had to learn to work around a few things that are difficult but nothing is impossible yet. The ramps getting in the way is about a push with using them as a workbench, no biggie either way. The jacks don't have enough throw in them so it's always a battle about lifting, blocking the car up with something then lifting again after resetting the jacks...probably made worse by my car being so low to start with. The overall lift function is awesome, no bind anywhere and very sturdy. One of the bridge jack does leak which is frustrating and it will pop my 20 amp 120v breaker every now and again.

Anyway, so far so good...