In reply to kipper12:
I have a rspb anti squirrel one for my sunflower hearts mostly to keep pigeons off it (since they kept flapping against it and knocking all the seeds out and I would prefer not to subsidise the local pigeon keepers hobby).
I havent seen the starlings try it but then they do tend to stick to the suet nibbles. I think they could probably reach through it if they really liked the sunflower heats but it wouldnt be easy.
I would suggest, if financially sensible, going for a mix of sunflower hearts + nibbles to keep all of them happy.
Despite their apparent numbers in some places as others have mentioned Starlings are under threat.