i have an exo 5500 and really enjoy this pack. As far as your decision goes it depends if you are using this pack mostly for a day hunt pack or a multi day pack. If briefly used the metcalf as well. both packs are plenty comfortable but the exo certainly is lighter. i found the metcalf great as a day pack but small if you plan to pack around your multi day gear. the exo 5500 would be my choice over the metcalf because it will compress down to the size of the metcalf or can be expanded if you wanna load it up. also the side pockets on the exo are nice. both pack have some similarities but i feel the exo has a slight advantage.