I don't like Hitec on reputation, but it's pretty marmite - some people swear by them, others swear at them
The difference in price is probably down to the age of the stock - Ace prices have gone up A LOT lately, so unless they have them on the shelf you probably won't get them at £60 any more. £70 is the going rate for the BLS range, except the 351 which is nearer £100