Steve, I know that you are a great caster and can launch an 8wt line with ease, but I believe you are speaking an often heard dogma that defies the laws of physics. I do not mean this as an insult to your integrity or fishing ability, I just question the basis of this mantra that I keep on hearing from fly fishermen. Physics dictates that a heavier object takes more energy to move as the force required to move an object is a function of it's mass and acceleration. Given that a 6wt rod/reel/line weighs less than an 8wt combination (same model and manufacture, but smaller) and a similar desired acceleration (assuming casting speed remains the same for any weight rod), the lighter rod requires less force (energy) to cast. It can be argued that a heavier reel balances the heavier rod and line, however a heavier object has greater inertia which requires greater force to overcome. For example, I don't think anyone would argue that a 16 wt rod requires less effort to cast than a 1wt rod, the difference between 8 and 6wt is just smaller, and may be negligible for proficient caster. Anyways, this discussion is beyond the point of this thread, so it need not be pursed further. I think that this comes down to the fact that either my setup is not balanced correctly or I am not an awesome caster, so in my opinion, an 8wt rod can be tiresome to cast all day. This may be the case fore others as Stonefish and others have mentioned. If money was no object, I would use a high-end, 10ft 7wt with 8wt shooting head line for beaches. Currently, I have a medium-soft-action 6wt and a fast-action 8wt rod. The choice of using a heavier rod is a no-brainer for me.