To Quote Lathejack
"Alright, they can flex a bit with their thin light castings, particularly the casting that supports the table, and the quills are a sloppy fit on most of them. But they are just a drilling machine and most are light years better than a noisy Black & Decker hand drill clamped in a drill stand."
This is all true and whilst better than a drill stand it means they wont drill metal at 90 deg and the drill might wobble.
Check the spec if there is one and some will admit to being for woodworking (no doubt for the above reasons) and personally i think any at the same price are likely to be built the same.
You can get a proper drill for decent money if you ignore Fobco or Boxford and look for Elliot, Kerry or Qualters & Smith. I bought a Q&S 750 for £60 off the Bay. Same power as the Naerok but drills a hole much faster.
You can tell it's a better drill – you can't lift it without help ;O)