Seeing as you can get a small buttons 1 for 75p - £1 depending on shop then it probably won't hurt to try 1. Personally I like any of the cadburys ones the eggs themselves are pretty much the same, also enjoy a ferror rocher egg but I am not paying the huge price tag, just after Christmas Asda had them reduced to £2 each so I tried 1.
So far this Easter I have eaten 2 small cadbury creme egg Easter eggs, and a large twirl Easter egg.