I've enjoyed faster rods on spinning reels so I guess I'll see if this transfers over well with fly fishing.Salt is where the expensive reels are really necessary, and then only if they are being used regularly, the salt just corrodes metal. The fish are bigger, faster and stronger, so the capacity for 200yds+ of backing and 10lbs of drag are actually necessary for a 150lb tarpon. I doubt any 100$ fly reel on the market today would actually fail to land any freshwater trout even after heavy use, so it really just comes down to if it makes you feel like, damn this is awesome, and yes its awesome to fish nice gear.
The rod you've purchased is sweet but it takes alot of casting to get used to a fast rod. I made the mistake of buying a faster sage as my first expensive rod and it actually handicapped my casting but in truth my cast sucked even before I bought it .