Well, seeing that I used to do jump squats with 405 easily at 19 yrs old... regular squats closer to 700 lbs... I was asked to be on the All ARMY powerlifting team, but exited the Army to go to college... Anyway, it feels like i just keep getting weaker. Just re-buldged my discs last week ...just regular squatting not even going heavy. I like to go real low to get the most stress on the muscle possible.. Was trained at 16 by Olympic Gold Medalist weight lifter from Cuba....so it's a 40+ year old habit.
It's really not that big of a deal... if you decided you didn't want it, just cut off the bolts, grind them down and re-epoxy if you have that or just go slow if you just have concrete. That's my view anyway.
I love the idea of that lift. But for the same reasons as you, I just couldn't go with it. I was thinking of the single pole lifts in a lot of shops.
Just so you know, I only paid $6k (after taxes in the Communist Peoples Republic of California) The actual price was just over $5k. Just a little more than the jack you are looking for. They also have those 9 ft. lifts with no top bar (cables covered on the floor)... you can pick those up for $4k, but you do have to still bolt them to the floor (even more so, because there is nothing at the top helping keep them from caving in on each other. (not that I've ever even heard of that happening... just thinking of physics here).
If I were you (from what you are saying) I'd get a four post and just shell out the extra for the bridge jacks:
4-Post Bridge Jacks Car Lift Accessories - Lift a Car with BendPak Products I"m not saying get a Bendpak, I wanted one, but after just a cursory review, their customer service is the absolute worst. But those brindge jacks give you the functionality of a two post lift with the storage ability of your 4 post.
I actually checked out the ability of 2 posts for storage and while you are not "supposed to" a LOT of shop owners leave cars on those lifts for a very long time. That's why I got the 11,000 pound ALI certified (means do structural defect or damage up to 1 1/2 times rated weight...in my case 16,500 lbs)... the A6 and the R8 are almost what each invidual arm is rated for. So leaving it on there doesn't seem like a stretch to me. I fully plan on leaving the A6 on it all the while the engine is out. Will probably keep it lower to keep stresses lower to the ground and it does have a thick overhead beam to keep columns from caving in.
Anyway... I seriously considered the 4 post... it's just that I wanted to be able to lift all tires off the ground at the same time, so I would have had to buy two bridge jacks...which effectively doubled the cost of the lift. I weighed that against leaving a lighter car on the 2 post lift and chose 2 post.
Also am paying $365/day for 5000 lb forklift with extended forks to get the lift out of the truck and up to my garage. I have a tractor that can ALMOST do it with forklift attachments but I've done this before with heavy equipment and almost blew out my hydraulics (I have a CT235 bobcat tractor)... Plus I bought some tools I didn't have... a LONG pry bar, magnetic level, tubes of quick set epoxy (for the bolts in the concrete), bigger torque wrench that I had (Longer handle), and 3 3/4" masonry drill bits. I'd say that whole shabang will be around $7k all said and done. You can get it installed for between $750-$1k but I"m such an anal perfectionist that I know I'd just be watching and frustrated as they cut corners for speed and ease... So I just opted to do it myself.
