The Line EX1 is a foot expression pedal that is designed for use with Line 6s line of modeling pedals like the DL4 and the MM4. It is pretty basic in make up as it is a simple controller that will control a variety of different things depending on what pedal you are using this with. It has 1/4 inch connections to send it to the pedal of your choice and is probably most useful when using it with the Line 6 FM4 filter pedal because you can use it with all sorts of wah wah effects, but is also useful with the other pedals in this line as well as it just adds to the amount of sounds you can get. While I've never used the Line EX1 for anything other than with the Line 6 models, I believe it is compatible with any other pedal that has connections for an expression pedal. While this expression pedal doesn't seem to be made of the sturdiest material, if you treat it well it should last a while and does its job properly. However, I do believe that the price of the Line EX1 is probably a little more expensive than it should be considering it isn't the most well made pedal in the world. Don't get me wrong, its not that expensive, but it also doesn't do that much and shouldn't be that much money to manufacture. Taking all of this into account, the Line EX1 will certainly do what it claims to do and it does it well. If you have any of the Line 6 modeling pedals, especially the FM4, and want a little more control over your sound, this will go a long way in making that possible. All in all, the Line EX1 is good choice as far as expression pedals go, even if this is only because of its compatibility with the popular Line 6 pedals.