West Indies spinner Benn said he felt that the home side was in the stronger position after the first day of the Test.
"All in all it was pretty good and we are pleased with the way it went," he said.
"They (England) could have a lot more runs but the bowling was pretty decent and we are ahead at the moment."
Benn admitted he did not expect his marathon stint of bowling which saw him deliver 33 of the day's 88 overs.
"I expected to bowl but not for that long or that length of time. Some balls spun and it is still a good pitch," he said.
And he said he had enjoyed the contest against Pietersen, who hit him for two fours and a six before mis-timing a delivery which flew up in the air before being comfortably snaffled by wicketkeeper Denesh Ramdin.
"Bowling against him was all good fun and very competitive. I like batsmen who come at me a little bit and it worked in my favour. You have still got to back yourself," he said.
"You will get hit for a couple of runs and some overs are going to go and some are going to be tight. You have to back yourself and keep going. I guess it is what they call Test cricket."
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