My son has enjoyed watching them, although he did complain about the selectivity of the Great Tits which pecked from the seeder, and discarded on the ground, any seeds which were not their preference.
The behaviour of a Coal Tit amused me. He visited the feeder, flew to a hanging basket, which we had neglected to take down, stabbed his beak through the mossy lining and flew back to the feeder. At first, I though he was wiping his beak, although most tits do this by twitching their beaks from side to side across a twig. I sat in the conservatory for closer inspection and found him to be 'planting' seeds for us. Whether 'squirrel-like' for another day, or because he preferred others I had no idea - although it seemed too much energy to waste merely to dispose of unwanted seeds.
My son was complaining about the waste of dropped seeds but I pointed out that birds which do not naturally perch on, or cling to a feeder, would gobble them up! Our son bought a compact camera on Boxing Day - really intended for his Scouting trip to Sweden, but also intended to capture action shots of himself and mountain-biking mates. He was experimenting with the zoom and speed - being concerned that the focus might not be quick enough for speeding bikes. He popped out into the garden to test it out on flitting birds. The shots below were his first attempts. Clearly, we needn't have been concerned about any seeds being wasted!!!