As the variety of themes adopted through the manufacturers became ever wider, the fundamental mechanics of these old machines remained much the exact same for generations. While a lot of them had three reels, designs were evolved which meant that some slot machines had four, five or maybe six reels in play. Images of these became synonymous with UK casinos.

There is no doubt that their popularity was due in no small measure to the hypnotic effect of the spinning wheels - and this is the reason why this formula is still one of the most popular forms of slots gambling today, among both punters as well as the machine companies. Many individuals mourn the passing of the old one-armed bandits, and their enduring popularity is shown within the fact that many old machines can fetch large sums on auction sites, and they are increasingly sought-after as collector's pieces.

The very fact that the machines also involved some physical effort on the part of the player also added to their appeal.