I'm a newbie here too, but have been a party to two or three trades. I was a little leery at first, but have been very pleased with the honesty and integrity of all I have dealt with here.
The way I see it, both parties are taking a chance. Communicate through pm's and do your best to be honest, ship fast, as if it's your job, and your expected trade item is your pay. If you are a good person and follow through with your end of the deal then the worst thing that can happen is that you may end up having to deal with a resentment of someone else, and of course having to replace a piece of equipment. If you don't follow through, or misrepresent your goods then you have to deal with whatever your conscience puts you through.
It seems to me that people here are just as interested in trying out a different piece of gear as giving someone else the same opportunity and vice-versa.
Until My Luck Runs Out,
EOSNewbie