Fortunately I decided not to buy anything, and when I got back home I noticed my laptop power cord actually has an input range of 100-240V, which meant I didn't need an electrical converter or transformer after all, just a 5 euro plug adaptor that lets me plug my power cord into the French wall outlet.
We were surprised at the bad service and thought we had just been unlucky with our sales person, but later on we found out this was typical for Darty, and when we'd mention Darty among our recently-arrived friends, everyone would roll their eyes.
Among tourists, the French—especially Parisians, and especially Parisian waiters—have a reputation for being rude and a bit stuck up. That may have been true in the past and probably still happens occasionally, but it seems it's one of those clichés that people keep perpetuating and are on the lookout to confirm. However, it was not our experience at all the whole time we were in Paris. In fact, people were very nice to us and generally made us feel welcome, but even so I suppose there always are exceptions and Darty seems to be one of them. From then on we went to the Fnac store, another French retailer we discovered further down the same street.
Among tourists, the French—especially Parisians, and especially Parisian waiters—have a reputation for being rude and a bit stuck up. That may have been true in the past and probably still happens occasionally, but it seems it's one of those clichés that people keep perpetuating and are on the lookout to confirm. However, it was not our experience at all the whole time we were in Paris. In fact, people were very nice to us and generally made us feel welcome, but even so I suppose there always are exceptions and Darty seems to be one of them. From then on we went to the Fnac store, another French retailer we discovered further down the same street.