I guess I'll be the first to say that the GP100 isn't the "best" revolver out there. That's because there is no such thing as the "best there is". The best is something that's very subjective. Everyone will have his/her own personal "best" gun. It will be the one that fits their hand, puts lead where they want it, and fires everytime they want it to. The GP100 will not fit that bill for everyone out there.
The GP100 is, however, a great revolver. It's well designed, stout, reliable and accurate. It's a quality piece but is priced at an affordable level. It's not the most refined gun out there, but it's ruggedness makes up for it. Out of all the modern day revolvers being produced the GP100 is one of the better ones out there.
Is it the "best"? That's something that each person is going to have to decide for themselves. For me, it's not, but it does come really close. I still haven't found the one that is the best yet. Until then I will keep buying guns that I like, and enjoying them.