I've taken a few OUIGO trains and never regretted it (nor have I regretted the money I saved!). I know some folks on the forum aren't fans but for me, they have been just fine. I would happily book one again. May I suggest booking the OUIGO PLUS fare, which gives you a greater luggage allowance (I always travel carry-on but not worrying about whether my bag will be a problem is worth it), and even more importantly, advance seat selection. Yes, you will need to bring your own food and drink, but that's half the fun in France! A baguette, some cheese, a sausage and some wine.......how could this not be better than whatever food they might sell you on the train? As a Canadian with little to no access to train service, my bar is pretty low so I am always delighted to travel by train (any train!) when in Europe. I imagine that Europeans likely have higher standards and expectations of their trains but for this Canadian, OUIGO is all good.