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Atom Force India's performance in testing this week has been remarkable. It's difficult to draw any definite conclusions because there are only 4 teams using 2010 machinery at this time (the other three are McLaren, Virgin and Hispania). However, of those four one would normally expect McLaren to be the fastest, given that their team was second in the championship and the others didn't manage to be in the top 6. Also, there could be some variance concerning how much technologies such as the F-duct and adjustable front wing were being used. Such technologies are easy to switch on and off but cannot be used on 2011 cars.
Despite the above, Force India have had the fastest overall time at all three lunch-times so far. On Monday, despite stopping testing some time before the end of the day, Nico Hulkenburg and Paul di Resta finished Monday second and fourth, Paul then finished third yesterday and as I type Adrian Sutil is still first on the timesheet (Robert Kubica only went faster than him an hour-and-a-quarter before the end of the test - as I started typing the next paragraph down). There's only been one small stoppage (di Resta lost some time at the start of Tuesday) and Force India is close to having 300 laps under its belt. In short, Force India has outperformed even McLaren.
The running is primarily helping Force India understand the tyres better; the new Pirellis are understood to be very high-wearing, so managing that wear will be critical in the success of any team this year. The new VJM-04, due to be launched next week, should give a true barometer of how much slower a 2011 car should be than its 2010 equivalent.