Someone in my family has been looking to buy an entry level road bike for around £300. Naturally my only answer is 'Decathlon, Triban 3' and they've been along to Hermiston Gait to check it out - minus myself, so this information is second hand.
They have the new white model in abundance:
http://www.decathlon.co.uk/triban-3-road-bike-white-id_8239800.html
They had 3 of the old red model as well:
http://www.decathlon.co.uk/triban-3-red-road-bike-id_8274036.html
I have been under the impression that the old one is somewhat better in specification than the new one and I advised to buy that one if possible. The woman at the shop however advised against it on the grounds that 'the gears rubbed and they had to fix it on the new one, which means they couldn't afford the carbon fork'. Now to my ears 'gears rubbing' sounds like something that can be fixed with 5 minutes and an allen key/screwdriver and in all the glowing reviews of the Triban 3 it's never come up.
I note that the old one had a Shimano 2300 drivetrain - not too familiar with road groupsets, so I don't know where that sits in the grand scheme of things, but in my experience anything Shimano can be relied upon. Meanwhile the new version has 'Microshift' branded shifters, a name that seems vaguely familiar from somewhere, but I've no experience with them at all.
About the only critical gear rubbing I can think of would be if the chainrings rubbed off the chainstay/bb area under load. Never had that close of a look at a Triban so not sure if this is a concern or not.
I'm sure there was no attempt at deception on the part of Decathlon, just seems a strange thing to be saying about the old bike.