Kimi Raikkonen has given the thumbs up to the car McLaren hope will challenge Ferrari's Formula One supremacy after its first test on Monday.
The McLaren MP4-20 is given its first run by Kimi Raikkonen
McLaren launched the MP4-20 at Barcelona's Circuit de Catalunya hoping to have avoided the mistakes that led to a disastrous start to 2004.
Raikkonen said: "A lot of time, effort and work has been invested in this car.
"My first impression after these few laps is a good one but the work for me and my driver colleagues starts now."
Team boss Ron Dennis said he was confident the new car has the potential to threaten Ferrari.
"Since MP4-20 was fired up for the first time at 1430 GMT on Thursday at the McLaren Technology Centre, the anticipation of the car's initial run has been building," he said.
"We are pleased to have completed its shakedown this morning.
"Today's unveiling is the first tangible demonstration of the team's preparations for the 2005 season, a year that has the potential to be exciting and positive for all the teams, our partners and the fans alike.
"There is feverish work taking place across the team to achieve the best possible result for this year."
The new McLaren will be driven by Raikkonen and former Williams driver Juan Pablo Montoya, with Alex Wurz and Pedro de la Rosa filling the test driver roles.
Raikkonen (left) and Montoya are hoping the MP4-20 is quick
"From the looks of the car it's unbelievable," said Montoya, who will not drive the MP4-20 until Thursday.
"I think McLaren did an amazing job with this car and we have to wait and see what really happens from now on.
"There's a lot of work been done by Mercedes on the engine part as well.
"We've done an installation lap and didn't have any issues. It came back in one piece," he added.
The car is fundamentally an update of the MP4-19B which was used for the second half of 2004 and won the Belgian Grand Prix in Raikkonen's hands.
But its design has been heavily influenced by the sports new rules, which include major aerodynamic changes, a requirement for engines to last two race weekend and for a single set of tyres to be used for an entire race.
The nose and sidepods have been dramatically redesigned as part of a series of changes.