The Dark Angel colt may have been well beaten on his debut at Newbury but he has shown huge improvement to win his next couple of starts.
The form of his latest success at Newmarket was given a major boost when the runner-up Lilbourne Lad won a Listed race at Naas on Monday and Hills is expecting big things from his youngster.
"He's a lovely horse and a very cool customer. He just does what you want him to do and is quite lazy at home," Hills told At The Races.
He's a very good-looking horse with a good action and he needed his first run because he hadn't learned his lessons at home.
"But he's now won his last two starts and I thought he did very well, particularly at Newmarket.
"It's obviously early in the year and you never quite know what you're beating and what you're taking on. You just know what you think of your horse at home.
"It was good franking of the form with Lilbourne Lad.
"He's going to run in the Coventry Stakes as he is definitely a six-furlong horse.
"I know he was fast enough to win over five, but six is much more his tempo.
"I think he's got the look of a special horse. It's obviously going to be tougher for him on Tuesday, but he is exciting. What ever he does on Tuesday, I'm sure there are some good races in him."
Boomerang Bob impressed when winning on debut at Kempton and was not disgraced in finishing second at Windsor recently.
Hills also has Ascot in mind for him.
"He did well to win first time out, which is quite a rarity for one of mine," the trainer added.
"He's got a gorgeous action. He's not a big horse but he has an enormous stride on him.
"He's quite fast and he'll take his chance in either the Windsor Castle or the Norfolk."