McLaren is struggling to "understand where the car is".
Feb.22 (GMM) Jenson Button has admitted McLaren is grappling with its new car for 2013.
At times it feels good, at others it doesn't.
Mark Webber agrees: "This sport is hard enough - and the cars difficult enough to understand technically - without taking risks unnecessarily."
Indeed, things are going well in the Red Bull camp.
"I'm very happy with the car, with the balance, how it feels," Germany's SID news agency quotes world champion Sebastian Vettel as saying.
McLaren's contrasting philosophy, however, was that development of the 2012 concept was almost exhausted, and so a new base was necessary.
Button explained that, had the Woking team simply evolved the MP4-27, "I think after three or four races you would realise that you're at the end of the development curve with it".
The problem right now, though, is that McLaren is struggling to "understand where the car is".
Button continued: "At times it feels good, at others it doesn't."
There are whispers in the paddock that arguably the best-performing car at the present moment is the evolved Lotus.
"It (Lotus' pace) certainly was not bad," Sauber's Nico Hulkenberg told Auto Motor und Sport.
"But Lotus was also good here during winter testing last year."
McLaren's Button thinks it's too early to say if there's a standout performer in 2013.
"I don't know," he said. "All I know is that no one is massively standing out."