Has anyone tried these??

[Fazerjon]

Has anyone fitted one of these without doing anything else and noticed a difference? It seems to good to be true. http://www.ebay.co.uk/itm/Oxygen-o2-sens...3cc2819611
I already have an Ivans FCE and to be honest the throttle is still snatchy.

[baggy]

I had one fitted to a Suzuki GS600 I had a couple of years ago and it made a slight difference