I ordered two of these, and one of them showed the problem with the design as soon as I opened the package. The first one I opened had obviously been sent back, since it had already been opened. The reason for the return seemed t be that the shaft was bent.
I've had other makes, and they have all been made with square-section tubing, but this is round tubing, which is much easier to bend. Fortunately, it was fairly easy to straighten out, but it shouldn't have been necessary.
The operating trigger is gripped by the whole hand, squeezing the handle, which works well, and will be better for people who would prefer to use more than one finger, which is why I raised my first thoughts on the rating to 3 stars.