Oh I had not noticed earlier you meant the difference is too small to be felt.
Well you wont feel the effects without thoroughly trying it out. I thought nothing of the difference as well for a few days until I went to an open road and went through second to fourth gears in VTEC zone. After that I was completely sold. Of course you do not expect a serious boost in performance (technically youre not even paying anything for it!), but for doing almost nothing its an impressive and noticeable gain... I got less improvements from a back muffler change. But it still isnt anywhere near as much as an FD mod I think.
Indeed a lot of people do this for a cheap way of an improvement.
But of course, you sacrifice quite a bit of road comfort for it.