The pro guide is one of the nicer tiller boats out there. Really stable ride. The 90 should push it pretty well. My only concern would be how it was stored. If the decks got wet and stayed wet, you could have some bad wood or waterlogged foam. I would also tap on the transom to see if you hear any signs of transom rot. Brunswick had to redesign their transoms after 2016. The price seems right, given the market. Id ask to take it to a yamaha service center and get a diagnostic/compression check. Also, if the electronics are old, I’d do a complete re-rig with an i-pilot in at least 24v if not 36v, and a couple new graphs. I’ve grown to really like having one on the bow.