Gotta love it, but he really should dive backmount yet so he can FULLY appreciate not having to carry all that weight on his back
Also, once you stop carrying the weight on your back, then you have the added expense of the sherpa or the rugged cart to carry the tanks down to the site for you
I am in the process of breaking down my doubles in favor of sidemount -- I have not dove them in over 9 months. Unfortunately, they are filled with mix. So I am waiting until I don't care or it can be used before breaking them down.
~Jeff