better value going for ultra?? I know the deposit is an extra £80 but... how long does the gas last if you are not welding much?I got a price on hobbyweld 5 20L Plus from a local distributor yesterday at around the same price. £84.50 and £110 deposit with a note that prices are only valid for current stock and will be going up slightly. 20L Ultra (300 Bar instead of 230 Bar) was £100 and £190 Deposit)