Yeah went there a couple of years ago and there wasn't loads there but maybe they have built more now as we got told by a tour guide they were building more to attract more tourists. Sunny beach can get abit packed but still nice and you should enjoy it
was in sveti vlas (just round the bay) last year. had a great holiday. The water park just outside sunny beach is good for a day out, wit free shuttle buses from all over the area.
The marina at Sveti Vlas is also worth a look, if you like flash cars, funded by Bulgarian Mafia money (allegedly).
went in 2001 to sunny beach, was ok but thought nessebar was lovely, was sat in restaurant in nessebar when the attacks on the wtc took place very strange reaction from the serbians on the next table.