The ability of using multiple people with different skillsets within one project has been great for our team! It enables us as designers/engineers to work across disciplines without having any issues or confusion about what we are doing next (or even how). I can't think of anything negative so far - it's just very easy to use once you get used to working through tutorials etc. Nothing really but if anyone was looking this would be my recommendation. We have found trezitoolkit extremely beneficial when collaborating between members who may not always know each other well enough to communicate effectively face2face or over email alone.