ISO advice re: drill to drill-press adapter

[ToolbeltDandy]

I'm not planning on using it often so the storage and expense of a dedicated drill press is hard to justify. Do you think that a tool which allows a regular drill to be used as a drill press would be worthwhile? http://www.ebay.co.uk/itm/PLUNGE-PO...werTools_SM&hash=item35bc38ab5c#ht_1842wt_754

Has anyone here used something like this before? Is it difficult to get the drill perfectly vertical?

 

[ToolbeltDandy]

Based on Internet reviews of various makes and models of this basic design, I decided to get something which I hope will be more robust. I bought this drill stand by Wolfcraft. I've only used it very little so I'm not yet ready to conclude whether it was a good choice. It cost a bit more than a Silverline pillar drill so I would expect it to be solid.

 

[Burnerman]

As miniature pedestal drills, these things are fine, but they soon wilt if there's any real pressure put upon them.
What exactly do you need to press?
John