I've read that particular saddle gets really hot in the sunlight...not a huge deal but just tell him to check it before he sits, on hot days.
I know not everybody thinks a squishy saddle is a good thing, and I'm sure for some people that's really true. But for me, the squishy saddle is the only way I can ride...I've tried the firmer ones and I end up with bruises. I have some medical issues that cause me a lot of discomfort as it is, I have problems with stiffness, sometimes I can't even bend enough to put pants on until I've been awake an hour or so. I can't handle all that and a bruised butt besides
The most I ever ride is about 15 miles in a day. The squishy saddle supports me just fine for that difference. I never start feeling a difference until about the tenth mile.