They are very thin and so do not intrude into the look of the model or the game.
The are heavy and add a nice heft to the unit plus the mean that the elements seldom topple over - even on hills.
They are not too badly priced when compared to alternatives.
They are ridged and precise - so ealy yo aligh elements.
They are magnetic - which means when combined with a "Really Useful Box" fitted with self adhesive magnetic sheets that the figures are held firmly in place - Honestly you can up end the box and they don't fall out.
Finally all this greatly reduces figure damage. I've only lost 1 figure in the last 20 years since adopting this approach and that was when I dropped a whole box from about 4ft.
The evidence is in the photos of my Indians all boxed up!
Indians in the box - note the magnetic sheet fitted to the inside of the box