I've got one of those things, too. You're right, it's surprisingly good for a budget tele-zoom. It's compact, but surprisingly heavy. It feels solid. The only reason I don't use it is because I rarely shoot longer than 50mm.
This was at 135mm, not stopped down at all (f/4.5).
For anyone who needs telephoto on a budget, it's a good, compact alternative to the Sigma or Tamron 70-300's. It's much smaller than those lenses, which makes it useful as an "emergency telephoto" for someone who usually doesn't shoot long, but wants to keep their options open.