I would rather have a suregrip than a mini spool. They are not very strong and they are really race only. I would not put much value in it on the purchase. Now the rest of it sounds pretty good. It is a shame that it doesn't have 3.55 or 3.91 gears.
Maybe someone can give you a value on it , I would say $150 to $200 bucks
It it had the clutch type differential in it I would say jump on it!