The Ping G10 Master irons are listed as having a Medium trajectory when in fact they have a higher trajectory than any other club out there. It should be listed as High. Also, these clubs have a far better spin rating than the 3 out of 5 listed in the charts.
The TaylorMade Tour Preferred Irons have a the correct trajectory listed, but the wrong spin rating. After numerous tests side by side with the Ping G10 Master irons, it's clear that their spin rating is considerably worse, even though on the charts it is listed as 3.5 out of 5 compared to the above 3 out of 5 for the Ping G10 Master irons. My data is consistent with the fact that higher trajectory clubs have more spin capability than lower trajectory clubs.
The Ping Tour W Pro and Master wedges also have greater spin and higher trajectory than is listed, and bear the same spin stat reversal with their TaylorMade counterparts as the iron sets above. The TaylorMade TP wedges are listed as having greater spin than the Ping Tour W series, when in fact they have less. Their trajectories are listed as the same Med/High, but the Ping Tour W series has a much higher trajectory than the TaylorMade TP series. Once again, my data is consistent with higher trajectory clubs having more spin capability as well.
I'd say that the spin ratings for the clubs listed, Ping vs. TaylorMade are reversed, with the Pings being the ones with 3.5 out of 5 and the TaylorMades having 3 out of 5.