However, your logo is a key part of your 'Corporate identity', i.e the visual elements of your brand that you do control, such as your website, stationery, brochures and advertising. When used correctly, and in conjunction with a consistent tone-of-voice, clear vision, ethics and service levels, these can help build a great brand. So it IS important to get it right.

A bespoke logo created by a professional should stand the test of time, and not be too tied to trends, as this will date it much quicker. However most logos, even of the most recognisable global brands, have evolved over time. Sometimes via small evolutions and tweaks, but sometimes through a complete redesign.

The key is to only update your logo for the right reason(s). I think it's unwise to change such a key part of your brand on a whim, or because you've grown tired of it (you look at it more than most so it can easily happen), or because you fancy a change and it has been a few years since the last one, or you feel it looks boring or old.