I purchased a D90 a few weeks ago and bought a Tamron 28-70mm 2.8 lens. I take mostly people pics but need some zoom for other occassions. I found a 70-300 on Craigslist for $120.00. They said it is about 5 years old but in great shape. Anyone have an opinion on purchasing this lens and the kind of pics it will take?

Thanks
Laurie