Generally more mild than your standard anionic sulfate surfactants. Unfortunately, they don't produce enough foam by themselves so consumers have typically rejected formulas based on these detergents alone.
Four cases of contact allergy to Decylglucoside in cosmetic products were reported (Contact Dermatitis 49: 304-305, 2004). The study author notes that cross reaction with related surfactants is possible.
Here is some more technical information.

INCI Name: Decyl Glucoside
CTFA Monograph Id: 4392



CAS Nos.
EINECS (I)/ELINCS (L)


58846-77-8
261-469-7 (I)


68515-73-1



141464-42-8





Empirical Formula:C16H32O6
Definition:Decyl Glucoside is the product obtained from the condensation of decyl alcohol with glucose.

Ingredient Source(s): Synthetic
Technical Name(s):

Decyl-β-D-Glucopyranoside
β-D-Glucopyranoside, Decyl-
Glucoside, Decyl
D-Glucoside, Decyl

Supplied by companies including Cognis, Kao, and Seppic.