One piece rods are definitely the norm for bass rods and many bass anglers insist on one piece rods. I think in the past, some sensitivity might have been lost with the way 2-piece rods were joined together but, I think that might not be too much of a concern with modern rods.
The pros of one-piece to me:
1) Zero risk of top half flying off or being lost, especially when travelling through the brush, it is easy to unknowingly drop one piece and then step on it while you look for it.
2) It rarely happens to me, but there is also zero change of the upper-half getting misaligned.
The Cons of pne-piece to me:
1)#$#$#$#!!!! I have a car and I can't "hide" such a rod in the trunk to go fishing (15 minute fishing stints) while out on an errand for the Mrs.
2) Since they don't fit in my trunk, I have to put down the backseat and cover the rods protrunding from the trunk. Even on a 5-10 minutes running into a store to buy something and coming out immediately is more than enough time to have your gear stolen. Shimano Curado D ($199) and Crucial ($129) would be a pretty pricey rig to replace. I get around this by taking my rigs with me into the store (I do get a few stares) but risks I can avoid, I do.
Two-piece pro:
1) Convenience. They fit in the trunk out of sight.
Two-Piece con:
1) Lose either half and you aren't going to be fishin'
I prefer the convenience of 2-piece rods myself because they are far easier to transport, but I rarely do I ever see 2-piece versions of rods that I would like to have.
My better bass rods are 1-piece rods and my trout, steelhead and ul rods are 2-piece. If only I can pull the trigger on the Shimano Compre 2-peice medium action for about $89.00. This rod for me would be my utility rod.
To me, a utility rod is what I would call an "all around" rod. This compre possesses a lure weight range of 1/4-3/4 oz, which is a pretty wide range of lures. It is a medium powered rod with a fast action so it should handle bass and trout with ease, and if I'm not mistaken, it handles line from 8-17# test.
To me, that is a good all arounder. It should handle inline spinners, spoons, and bait fishing just fine for trout and should easily handle topwaters, crankbaits, spinnerbaits, and smaller T-rigs well for bass.
Ugly sticks aren't bad at all, especially if you believe it is serving your needs.
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Arx