HI, I did contact a guy on one of your stands at an Elex show, to be honest he wasn't interested, it was a case of " how do we know what you've done with them", Now I'm not one of those who complains about stuff without reason, and I look after my tools, in fact I have 2 Makita drills, one bought about 30 years ago, and one bought back in 1999, and they are still going strong. Tools are an investment when you use them to earn a living, so you have to buy those that not only represent value for money, but last a decent length of time, assuming they are not abused of course.
One of the problems tool manufacturers such as yourselves face is quality, versus sales. If you produce a very reliable product that lasts years, then yes, you will have a lot of happy customers, but it does your sales no good if customers only need to replace an item say every five years. Now assuming we are talking screwdriver bits, then if we assume that the end user uses them correctly, I.E, impact rated bits in impact drivers, pz bits with pz screws,etc then they should last a reasonable length of time, months rather than weeks.
It's very hard I know, I remember reading a review on a set of diamond core bits, the guy was slating them, he'd only got one hole in ordinary brick with a 115mm one, then he went on to say that after he'd been given a replacement set he'd discovered they worked better without hammer action! If he'd known anything about diamond cores, or maybe even read the instructions, he'd have realised that diamond bits should never be used on hammer.