I have 6 of these adaptors now and they prove very easy to use, with the easy locking mechanism, and means I can mount and remove a 6m length of truss on my own. The fixing and bolts are very sturdy and never leave me in any doubt as to the security of the rigging.
Be aware that if you are going to overhang heavy fixtures or fixtures off of the front/rear of the bi-beam truss then you will start to see deflection in the adaptor, but this is because they (or the truss) are not designed to deal with the twisting forces this presents.