I don't have any negative feedback on bike brands, sorry. The only thing that I might say is that I think that
BMC bikes are a bit too pricey. They are originally a Swiss company, and so they're quite popular here (although a guy in a local bike store told me that they're no longer made in Switzerland). They do make some beautiful bikes, and the design, engineering, and technology is top quality, but this means that you pay a bit more than you would for a comparatively-equipped bike from another manufacturer. You are unlikely to notice the difference that this extra money brings you unless you are really serious or really picky.
There is very little in the way of online bike sales within Switzerland, so you'll generally have to buy locally of buy from an online store in the EU - in which case you should obviously look at the UK for English-language sites.
I do know a bit about most of the bike stores around Lausanne. If you'd like to speak to someone in English, then there are two stores that I know of to try:
The Bike in Pulley, whose owner is originally American, they have a lot of Specialized and Cannondales; and
Hood Cycles, whose owner is originally English, they build their own brand of bikes - they don't build frames, but they'll make a bike from one of their stock frames with any component combination and frame colour that you want. Another good shop for road bikes is
BBR cycles, located a few kms north of Lausanne. They are the biggest
Trek dealer in town, and they have a few other brands of road bikes, too, but I've never found anyone in there who speaks English, but that means it's a good chance to practice my French (I own two Trek bikes, one touring and one racing bike, and I love them both).
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