Well I prefer it off myself Im pretty confident in a car and usually know what to do when it steps out of line (usually inflicted by myself and held as long as pos) but for anyone who doesnt know, if the brake light switch is activated (the middle pedal pushed down slightly) all the electronic systems are activated again, kind of a failsafe, try it in a wet carpark, get the car into a drift then touch the brake pedal n see what happens
Personally id be keep the vx till the winter then change, get yourself on a drive training day somewhere, you will lean loads and really get to grips with your car more, Ive had a mk1 elise & mk2 elise so I can feel for you a bit in the wet, a bit scary sometimes