I've seen alot of nice fish taken wading.
no cost, easy access, effective... take your $100 and come up three times, instead of paying the guide.
Time in the water = a much better chance at getting a trophy brown.
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so I suppose this would be one con; plain and simple expense
if there's any questions about where to go and what to do there are tons and tons of people on this forum (and elsewhere) that know how to catch a trophy brown below the dam.
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also as I guy who does fish the winter, I'm not sure I'd say the winter is "the time" for trophy brown. Metabolism is low. I've seen more in the fall, when they Prepare for the winter.
just like elsewhere; time on the water, and using an effective & appropriate approach gets you the big fish.