They're pretty good. If you're buying used and just want a basic, newer used Spyders have the resale value of a used condom (ie. you can pick up a lot of marker for around $50).
What's your budget? You can probably find a used marker of better quality depending on what it is.
__________________ MCB Feedback
Please ship to me using US Postal Service when shipping to Canada.
Don't ship to Canada? No worries--I can work it out with you: US Parcel Pickup