Bottle Jack / Jackstand Combo

Has anyone used 1 of these jack / jackstand combos?

What does everyone think? Kinda slick or is it too gimmicky?

Powerbuilt 4000Lb Unijack Bottle Jack & Jackstand in One - 620470

I just googled "Powerbuilt 4000Lb Unijack" and read some interesting reviews on Amazon. Some good/bad points to consider.