It appears that gen 1 baskets affected differently across individual bikes. Mine got worse as the mileage increased, and it wasn't really through the bars, it was through the bike, but a deep vibration and not a peg/bar tingling vibration. Chudder is a word I've heard used to describe it, and it does perfectly IMO. Higher gears, lower speeds were a no on the original basket.
With the new basket installed I could tell the difference just on start up and how it picked up on the revs, quieter and quicker. Riding it was even more pleasing, smoother, higher gears/lower speeds are now comfortable, just better in every way.
Pre change over I'd just been on a 2500 mile trip to and around Scotland and it irritated the life out of me. Post change over I did 5000 miles around Europe, so much better to ride. Mine wasn't a slight improvement, it was night and day.
I suppose it all comes down just how bad you bike is with the original basket.