My current Stanley knife has been awkward to use for years, I don't really know why but the blade has always been difficult to slide in or out, really should have replaced it years ago but anyway today it has died, it was not natural causes. So am in the market for another, is there a better alternative than the classic Stanley? Price isn't really an issue as even the expensive ones aren't likely to break the bank. Also is there any difference between the stock Screwfix blades for £9 vs the Dewalt £18 etc?