I agree with comments on manufacturers finding ways to shift tin - it's what they need to do to survive.
If it is good value is up to the individual, I had the cash for my bike, so I am buggered if I am gonna sign up for 7% interest when I can't get 0.5% on my savings!
It is certainly better than a Wonga Loan, but probably far more expensive (overall) than a well negotiated personal loan - but the payments will be higher and this final balloon payment is what gets people a low monthly rate......
..... and ensures a lot of people upgrade after 3 years, if you could not afford the extra monthly payments on a normal loan, your hardly likely to have £6k kicking around so you either need another 3 year loan to pay off the balloon (and how much would you have paid in total interest having financed your new GS for 6 years!) or you just carry on with your £xxx per month and get a new bike.
This keeps new sales rolling, and a good stock of recent low mileage used bikes coming in, great for the dealer, but as a punter you risk paying interest to the finance company for the rest of your biking life, and always taking the huge depreciation a new bike.....
But whatever way you look at it a bike costs you money, I like the odd beer and the residual value of that is sod all, same goes for holidays, each person knows what having that new bike is worth - and as long as you do your sums and understand what it is really costing you and all of the options then all is good.
Personally I would be keener to buy a 2-3 year old bike which would cost a similar amount over 3 years with no balloon if I did not have the cold hard cash to buy outright.
Just don't leave savings in an ISA at 0.5% and then take a 7% loan out as often sales folk will try to get you on finance for all the benefits (and extra commission) they make from it, 7% on £10k over 3 years is about £2k extra in their pocket!