I bought a 9000lb atlas from greg smith in 2013. Was about $400 bucks more than the light weight ones but other than more capacity its taller and wider to accept my duramax truck. I also can stand up straight under it without bumping my head when just inspecting.
Have had no issues with it at all.

Neither of mine are anchored and have never had a problem. Nice being able to roll it outside if I want to pressure wash the bottom of a car.

I also bought a 9,000 lbs Atlas from Greg Smith Equipment. Its not bolted to the floor and rolls around if I need to move it. 120volt setup. I can easily stand underneath it. I bought the LED light kit so bottom of the car is totally lit up.
Also bought 2 jacks with it. I love it. I think Im going to have to buy another just for storing more cars.
Free shipping to my garage. Good thing I had a skidsteer with forks. This thing was heavy!!

"Neither of mine are anchored and have never had a problem. Nice being able to roll it outside if I want to pressure wash the bottom of a car"

Agreed thats a great option,but having the extended height version with higher posts ,my assembled unit would not roll out of the 8 ft high garage door anyway and I only lost the ability to move it within the garage ,so the choice was easier. That, and I just didnt like the fact the feet would move around the garage

Bend Pack. Very happy with it.

I also have several Atlas lifts from Greg Smith that I use primarily for storage. I usually buy the EXT version which allows a higher lift. Super reliable and easy to move around. Came with ramps, wheels, drip pans, and the jack plate. Hard to beat the price and quality seems good.

I have a Bend pac HD-9ST 9000 lb narrow lift for standard garages and it works great. VERY happy with it. Love the pneumatic stops so no walking to each end to release when I want to lower it. Just push a button and down it comes.

lifts
 

I have a 16ft high ceiling and 14 and 10ft high doors so any clearances arent a problem.

Mine is not bolted, but I put 4 heavy duty rubber pads underneath it so it stays put on my epoxy floor.

I bought a challenger and set it up myself this spring. It is not bolted and I havent really used it much yet but one thing I dont like is you have to hold the unlatch lever until it it clear to the floor. Not real handy. It was super heavy and like a previous poster, skid loader was real handy. I could have gotten a bendpak also from the same place. I am not thrilled my salesman didnt tell me about the lever. He did say they could get parts better from challenger.