I have just been upgraded to 200mbps and have no problems at all.
Most ethernet cables will support much faster than virgin supply, as stated previously you need to check the ethernet card/port on your PC, laptop or other equipment to make sure it can handle the speed.
You ethernet card/port needs to be gigabit and NOT 10/100 to make full use of the 150mbps, wifi does'nt really have this restriction any more as most wifi devices are rated higher.
Have a look at the manufacturers website to see if they list the specs or look in the instructions if you are not sure about the port speed.