My Frigidaire front-loader's dispenser does not behave well with liquid detergents, though I wish it did. There's some pretty good ones, e.g., Costco's Kirkland Signature, that I'd like to try sometime...
OTOH, my machine has been howling LOUDLY for a year now so it's time to look around for a new one. Miele? Wascomat? Milnor?