Despite how much research we do on-line, or how many data sheets and user manuals we read before we buy a piece of test equipment we often find that, once it's in our hands, there is something about it we discover we don't like.
Wouldn't it be great to try it before we make the final decision?
Enter Amazon. So, would it be moral to buy stuff on Amazon, keep it for a a couple of weeks and then return it, then do this for all the competing devices until we find the one we like the best, then buy it permanently?
I don't think Amazon would have an issue with this as they guarantee satisfaction.