There are well-made and come with all of the accessories you need.  I use them with P90X3 when traveling both for curls as well as the door attachment for modifying the chin-up routines.  The grips and attachments seem really solid, so no concerns about a "blow out" like I had with the band that came with my P90X3 kit.  It's nice to be able to combine the different bands to achieve resistance beyond the thickest band.  The travel pouch is nice, but I usually travel with just the bands I need tossed into my backpack.