I do own two other Orvis rods, but not the Clearwater. I can't remember if I have casted it, I may have. But my guess is that it's a pretty decent rod, and that model comes with a 25 year warranty. I own other brands as well, Sage, Lamiglas and TFO.
If it's not a suprise, maybe she can sign him up for the Fly Fishing 101 Orvis does, it's free and will give him a chance to try out casting. They might even use the Clearwater line in the class, if not after the class he could cast it and see if he likes it. I know the two Orvis rods I own, a 5wt Helios 2, and a 3wt Super Fine glass, cast great and both catch fish. I can also cast my inexpensive TFO Lefty Kreh Professional 2, almost as good as my Helios 2. I can probably really cast it just as good, but I like to think the more expensive one casts better.
There are a lot of options out there, but get a decent rod, and a good line, for a 5wt you don't need a $500 reel. I'm not saying eventually he won't want one, but you don't need that kind of drag on a 5wt. But hey, I have a Hatch reel on my 3wt.
It's a $200 rod, with a 25 year warranty, with a $100 reel- so basically you are getting line and backing for free.
Hope that helps a little bit. Good luck and hopefully tight lines!