Will this fit my Breville Barista Express?

Yes. The Barista Express and other 54mm Breville and Sage machines use this screen, gasket and disk size. It does not fit 58mm models such as the Dual Boiler.

Does the IMS screen change the taste of my espresso?

It changes water distribution, not the coffee itself. More even flow across the puck tends to give more consistent shots and less channelling than the stock screen.

How often should I replace the silicone gasket?

Replace it when the group head starts leaking or the portafilter locks in too easily. Silicone lasts longer than rubber and stays flexible, but it is still a wear part.

What is the blind disk for?

It seals the portafilter basket so you can run a backflush cycle with cleaning tablets. It is designed to hold tablets in place through the whole cycle.

Do I need to remove the old shower screen first?

Yes. The stock screen comes off before the IMS screen goes on. A screwdriver or the machine's screen screw is usually enough, but the kit does not include tools or instructions.

Is it worth it over just buying a new stock screen?

If you want more even extraction and easier cleaning, the IMS screen is a real step up from stock. If you only need a replacement gasket, buy that part alone.