have not tried any tokina macro but the tamron 90mm is a good macro which dun cost much.
apart from the plastic body and slow af, macro reproduction is good. am sure u can find lots of pics on the forum from this lens.
If you so wish to view tokina macro. There are some macro i took awhile back using this lens : http://metallilan.multiply.com/photos/album/69(minus the IR shots, most are taken using the Tokina 100, there are also some other shots in my recent galleries taken with the lens, with the Fashion Show being one of them)
Both are generally good lenses. Most people tend to overlook the Tokina 100mm. Or maybe its other sibling the Sigma 105.