So, tell me about your kitchen sink

[Ntinyn]

I'm looking for an undermounted stainless steel one bowl sink, at least 54cm wide (to accommodate baking trays). Only really looked at Franke and Blanco in real life at kitchen show rooms but open to other brands. Have read that Blanco has better customer service but a shorter warranty, whereas Franke has longer warranty but crap service. Have you gone back to manufacturer for any issues?
Since its under mounted I can't really afford to get the sink decision wrong as I'm guessing it's a b!tch to rectify with solid worktop.