The Ultra is not terrible just full of silicone, acrylates, and shea butter which is irritating to some and I don't think should be marketed to ultra sensitive skin:
AQUA / WATER
ISOCETYL STEARATE
SQUALANE
BUTYROSPERMUM PARKII BUTTER / SHEA BUTTER
DIMETHICONE
GLYCERIN
ALUMINUM STARCH OCTENYLSUCCINATE
PENTYLENE GLYCOL
PEG-100 STEARATE
GLYCERYL STEARATE
CETYL ALCOHOL
DIMETHICONOL
SODIUM HYDROXIDE
ACETYL DIPEPTIDE-1 CETYL ESTER
ACRYLATES/C10-30 ALKYL ACRYLATE CROSSPOLYMER
The fluid has a much cleaner and minimal formulation and oil free (I believe), so less likely to cause reaction with most:
AQUA / WATER
SQUALANE
GLYCERIN
DIPROPYLENE GLYCOL
CARBOMER
SODIUM HYDROXIDE
ETHYLHEXYLGLYCERIN
CAPRYLYL GLYCOL
I haven't tried it but I do wonder how the Chanel La Solution 10 compares to the Toleriane Fluid, it's similar in minimal formulation (though Chanel has a few more ingredients and shea butter, but the extract so potentially less irritating) but frankly it's such an odd product in the Chanel lineup, they do pampering skin care with nice smells and this isn't that at all. It is, however, ridiculously expensive for 30ml, yet I'm still curious why they devoted so much R&D money to this product (or so they claim).
The Chanel INCI for comparison, it sits somewhat in between the Toleriane Ultra and Fluid:
WATER
SQUALANE (OLIVE SOURCED, NOT SHARK)
LAUROYL LYSINE (AMINO ACID)
GLYCERIN (VEGETAL)
CAMELLIA SINENSIS LEAF EXTRACT (SILVER NEEDLE WHITE TEA)
SHEA BUTTER EXTRACT
SODIUM POLYACRYLATE (EMOLLIENT)
STEARETH-21 (EMULSIFIER)
CAPRYLYL GLYCOL (HUMECTANT)
PHENOXYETHANOL (PRESERVATIVE)
I know Beiersdorf (of Nivea, Eucerin, etc.) and LRP pretty much both make the bulk of base creams which other companies add their own formulations to. I half suspect the Chanel La Solution 10 is the Fluid base tweaked with some added beneficial extracts.