Saracens boss Mark McCall labelled his side's win at The Stoop over Harlequins as the best yet this season.
The 2010-2011 champions have got off to the perfect start in the Aviva Premiership so far, picking up 19 points from a maximum 20.
The win at The Stoop saw Saracens draw first blood against a Harlequins team that will be contention for the playoffs, leaving McCall pleased with how his team came from behind at half-time to win.
"In many ways that was the most satisfying win we've had this season," said McCall.
"Gloucester, Bath and Quins in a row was a tough ask, but it's been the manner of the way we started - we've played some decent rugby along the way.
"We've got off to a flyer, but Northampton look incredibly impressive. But it's not about how you start, it's about how you end.
"We just always want to be there or thereabouts and put ourselves in the frame for the top four, but we never look too far ahead.
"We were very good for most of the game. When you're down 12-6 teams can react by losing composure, but this group is very good at retaining composure and doing the right things.
"We built pressure on them all the way through in that second half. We won the second half 16-0 and played really well."
Harlequins director of rugby Conor O'Shea conceded that Saracens had been impressive and insisted his squad would respond.
"They're physically very powerful and were the better side on the day," said O'Shea.
"We played well in the first half, but in the second half we just didn't hold on to the ball for any length of time.
"Saracens have huge strength in depth and probably have most of their key players fit.
"Everyone knows they are an excellent team and will take some stopping, but Northampton went six from six at the start of last season. Things change drastically in the season.
"We're disappointed to lose at home, but it's important the players don't feel sorry for themselves.
"We're fine and I'm very comfortable with the group of players we have."