Versatility

• 1). Check the dimensions of the jig, and that it suits your needs. Most adjustable jigs are capable of a section anywhere from 16 to 24 inches long. Choose a longer jig if the most common joints you make are longer than the short model, but shorter than the long; or if you do a lot of long joints that require additional setup time for every section.
  
  
• 2). Examine the fittings and hardware for the depth adjustments, dovetail size adjustments and other variables, to meet your needs. Look for precision parts with easy adjustment that get you a precise result.
  
  
• 3). Study available literature, both with the tool, and in magazines and online to find out about other features each jig has. Many jointing jigs do dovetails, box joints and others. Choose the most versatile, if making multiple joints is part of your woodworking norm.
  
  

Ease of Use

• 1). Set the jig up and tear it down if possible. Determine how easy it is nto use under normal working conditions. Look for problems that may cost you time, or even make jointing more difficult, which can ruin materials.
  
  
• 2). Borrow a similar jig from a friend, or a woodworking shop and test it, or ask for a demonstration. Get hands-on experience with the tool if possible, then compare it to your experience with other jigs. Remember, if there is a learning curve, that can delay projects.
  
  
• 3). Determine where and how you will store the jig. If it comes with multiple loose parts, see if a box is included, if not, that is an added expense to consider. Think through transportation as well, and choose a jig that suits your style of use.
  
  

Cost

• 1). Look at the purchase price as the determining factor only between tools equal in other ways, or consider a tradeoff in features to save cash if budget is your primary concern. Ask for a discount, jigs on clearance, or for a sale coming soon. You will not regret a quality purchase; you may soon regret a cheap tool.
  
  
• 2). Add up the total cost of the jig, plus any accessories you need to make it truly usable for your purposes when calculating cost. Include storage boxes, additional jigs, clamps or other items, and determine whether it works with your current router type.
  
  
• 3). Read reviews, ask opinions and check the warranty to ensure this tool will last you a long time. Calculate the cost of replacement of parts, if it has small or easily breakable parts. Add all this together when determining which jig makes sense financially.