I have just converted to EFI, currently at my relatively low boost performance isn't dramatically better however it does give scope for future power hikes beyond the reaches of MFI.

However,

It starts every time
Power delivery is smooth and even
Fuelling is safe spot on all the time
LOTS OF TOYS (launch control etc)
Its much more economical

Generally every thing about the way the car drives is better.

Do it you won't regret it!

Rob,