What I think I have heard which may not be 100% correct so take it with a grain of salt, is Astro and Procraft were sister boat companies made in same plant in TN, later bought out by Tracker Marine and just went away in favor of the Nitro brand. I think that one may be pre Tracker.
I always have considered them cheaper built boats, but that is just from observations. I have only ridden in a couple. So just like bullet stated, check it very well.