They absolutely love it and yes it is suet. I get it from our local garden centre. They all seem to love the pink one best. It has berries in I think. The insect one didn't get eaten as quickly. They all fight over it and once the starlings are on there is no chance for any of the other birds. The bluetits love it as well. There is also a fatball feeder which they squabble over as well but the suet wins hands down.
I didn't realise that the starlings would eat from the feeder. It was a real surprize as they generally just came for bread on the ground and up to that point hardly came into my garden anymore as usually there was a better taste of bread next door (must have been Warburtons
) anyway one came and then another and before you knew it there were up to a dozen trying to feed off the suet at once causing quite a scene. Since then they have been regular feeders every day.
It seems to have brought more birds into the garden as we have more bluetits and a longtailed tit and a great tit now that feed.