Having the wheel and being able to use all of it's potential and benefits are contingent on how your are mounting the wheel and keeping the pedals stationary and fixed at the correct angle to how your are sitting.
If you believe that you can just hook the wheel up to your table and stick the pedals down by your feet and drive like a pro your kidding yourself. You need to get yourself a good driving rig to mount your wheel and pedals in it. There are alot of cheap rigs and a few really expensive rigs but if you don't want to build your own the best startup rig would be the Playstation Driving Rig.
Here's a link to it.
http://www.playseat.com/en?gclid=CNWYoLiv5agCFYt95QodBmo4DA
Do yourself a favor and either build one on the Playstation Design or buy the Playstation Rig and then you'll really be able to experience the benefits of having a Driving Wheel. I've had my basic rig going back to when GT3 first came out and have only upgraded the Seat to a regular car bucket seat with sliding bracket. I replaced my DFP with a G25 Wheel and that in itself was a huge improvement over the DFP wheel. Much better FFB and much better gearing in the wheel.