it is decent enuf lah, like mpenza said. i've got a 2nd-hand tamron 28-200mm (bought from ah meng), and the shots are not bad. think if u really want one, have a look at buy/sell. every now and then, there are the upgraders throwing out their 28-200mm.
if u going on holiday, this lens does save u a lot of lens to bring along! i left some of my lens behind when i went to msia with this lens.
hmm... that the one in the ad of this months practical photography right? the one that you pull the lens forward and backward instead of rotating the bezel?