The Vibramate string spoiler is an essential for a Bigsby. If you have ever had to change a string you'll appreciate how much of a pain it is, especially if you have to double back on the string.
The vibramate makes a restring a lot quicker, it doens't change the sound of the Bigsby at all, and it doesn't look bad when it's attached to the instrument either. Unfortunately, I don't think the Vibramate comes in any colour other than chrome, which is a pain if you have a gold or titanium Bigsby.
The piece is held on by the pegs of the Bigsby (where you would usually put the nut of the string.) It's held on by sting tension so you don't need to fit anything really.
You will need to remove the strings and lift the arm to attach it, but it only really took 5-10 mins including tuning.
People should seriously consider this a vital part of the Bigsby, don't let the price deter you.
It comes with a sticker too, if that's any incentive :)