| The reason I went for this rather than a dedicated bench was simply one of space. To use a work bench, you need at least a metre all round plus the length of the bench plus the space to get the bike lined up to shove onto said bench. In my case, it was making things very tight in the workshop.
With the bike lift, all you need is the length of the bike plus your metre all round, and when it's not being used, the whole thing hangs on the wall.
From the stability point of view, they do a slightly bigger version called "Big Blue" which I seem to remember is a tripod arrangment, that would work much better on uneven ground I imagine. | 
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