I would try to shoot a can first before you buy. I bought the YHM Mite can and was not real impressed with it. I have shot a sparrow can and it seemed to be much quieter than mine, but was a lot more money. If I had to do over again I would have went the 5.56 route so that I could use it on my AR and 22's.
As for the trust I have had some of the online trust building tools, but still a lot of paper work, $$$$$, and then the WAIT...
You can also try CB .22LR subsonics 750 fps they are quiet and no can required...