Try a few user reviews of something that sounds similar:
http://www.photographyreview.com/pscLenses/35mm,Zoom/Vivitar/PRD_85175_3128crx.aspx#reviews
Personally, I found that when these wide range zooms first came out they weighed a ton, and tended to be fiddly to use.
It is very cheap though, so even if it is junk you can always give it to a charity shop.
But if you want a zoom range that will last you a long time, I would seek out 2 lenses, maybe a 28-85, and a 100-200. And yes, that misses out a few millimetres, but it may be just as light as the vivitar, and will be easier to control. You could even go for a rokkor 28-100 ish, and get a 2x teleconverter. Much lighter, and probably optically as good.
A hint: Dont look for lenses, seek out
ebay sellers who are selling complete outfits. 6 days ago I bought a silver Minny X300 for about 42 dollars, with a 50mm prime lens. I wanted zoom, so 2 days ago I paid another...? 100 dollars to get a Minolta 24-70, a minolta 100-200, and a cobra flashgun. The fact that it was sold as a kit, with a black X300 and a large camera bag is a real bonus. And if the black body doesn't work, np, I will keep it as spares or throw it away. (The silver/black one is amazing, I have run a film through it, and it makes me regret buying myself a second digital camera for Christmas, it is so sharp.)