Welcome!
I always watch the auctions on Ironplanet, but haven't bought anything from there. There's something about not being about to run the machine before purchase that makes me hessitant to bid on anything.
If you don't mind sharing, did you have problem with Ironplanet specifically or the actual seller? Ironplanet really likes to promote themselves as a safe and reliable place to buy equipment, but as we all know there are two sides to every story and it would be nice to hear some firsthand experience.