The Gabba really is a good piece of kit to have available to you, I would suggest keeping an eye out in the sales ~ I picked one up early last year before the Gabba 2 came out for £70 odd.
I have the yellow one and a black one, I suggest you stick to black due to the grime you pick up if you do consider one.
A number of manufacturers now offer similar products, like Rapha, while I have their race jack which is similar to the Gabba I see no need (for me) for the baselayer.
The baselayer seems like a cut down gabba, no need for the storm flap or rear pockets as it's an under garment, so if it performs like their jacket or gabba it would be a great item for racing or when you need to be seen in certain kit.