Tindall and Tuilagi were paired together in the England midfield, and they played a key role in England winning 20-9 against Ireland in Saturday's World Cup warm-up match in Dublin.
Tindall said on Sky Sports: "It's difficult because I'd trained with Manu but never played with him, and you never know how that's going to develop.
"You saw the raw power that Manu's got and the raw talent, and every time he takes the field in that shirt I think he's going to grow and get better and better."
England gained revenge for the defeat to Ireland which ended their Grand Slam hopes in the Six Nations Championship, and will leave for the World Cup on a high.
Tindall said: "It's massive, especially a win here.
"We were disappointed with how the Six Nations finished and how the Wales game finished and had lot of points to prove to ourselves.
"Credit to our defence, I thought it was outstanding today.
"Whatever they hit us with we kept hitting them back and that's credit to the boys.
"We sat down last night and talked of the stuff that happened last time (against Ireland) and remembered how we felt after the last game."
England started well, with Tuilagi crossing for his try after six minutes.
Ireland captain Paul O'Connell said: "After that we made a lot of mistakes.
"That's one thing we didn't do six months ago (in the Six Nations match), we played mistake-free rugby."
Ireland lost David Wallace to a knee injury, and O'Connell said: "It's tough to lose guys but so did England.
"It's not an excuse we can make.
"We've got a squad of 30 players and we've got to make the most of it."
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