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

There is without doubt that their popularity was due in no small measure to the hypnotic effect of the spinning wheels - which is the reason why this formula is still among the most popular forms of 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 in the proven fact that many old machines can fetch large sums on auction web pages, and they are increasingly sought-after as collector's pieces.

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