The formula is split into two finishes--metallics (Foil) and glitters (Glitter)--and the performance depends largely on the finish. In general, the formula is supposed to "glide" on with an "ultra-thin, water-resistant gloss of color onto the lids." Though each compact seemed to be the appropriate size for a standalone eyeshadow, they only contain 0.03 oz. a pop, which made them some of the smaller single eyeshadows on the market. There were some really lovely shades but enough inconsistency that for the price point, it never amounted to being an impressive range.
The Foil finishes have a softer, more yielding powder base that have moderate to high shine (some are actually metallic, some are more pearly) with better color payoff, easier application, and better wear. The Foils tended to be creamier and smoother with better adhesion and blending on the lid, though there were a few shades that seemed to have too much slip and a tendency to go on unevenly or blend out unevenly during application. For the most part, though, the Foils were good eyeshadows and were easy to work with.
The Glitter finish shades are supposed to have "micronized glitter" and find that they don't really work as well as intended. They have more powdery base colors and larger flecks of micro-glitter, so that they tend not to bind as well and result in fallout during application or get lost in a brush. I tried applying with fingertips but the majority (like 90%!) of the glitter sticks to the fingertips and doesn't budge. Due to the more powdery base, they did not work particularly well with a dampened brush either. Your best bet would be to pat them on top of a cream eyeshadow or tacky base.
The average rating based on all reviewed shade(s) in this formula is shown below.
TOM FORD SHADOW EXTRÊME is a light-reflective, long-wearing shadow that mimics the look of melted metal in two distinct finishes—micronized glitter, which gives a lustrous, opulent finish, while a bolder, shinier look is achieved with a foil finish. Longwearing polymers ensure each shadow glides an ultra-thin, water-resistant gloss of color effortlessly onto lids. Twenty clutch-sized eyeshadow singles, from shimmering sapphire and silver to fabulous fuchsia and lemon, are housed in a mini-mirrored compact, finished in reflective chrome tone packaging, a signature for the Extrême collection.