Jenson Button has lavished praise on the gains made by the McLaren-Honda team during the opening rounds of the 2015 F1 season after scoring its first points in the Monaco Grand Prix.

Following a troubled start to McLaren and Honda's reborn collaboration, Button finally notched up the team's first points during the sixth race of the season around the streets of Monaco with a solid eighth place finish.

Though Button at the time said the result doesn't come close to representing the overall objectives of the team in the long-term, he insists McLaren-Honda has come some distance since the opening races and testing when the MP4-30 was slow and unreliable.

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"McLaren-Honda are doing a fantastic job," he said. "From where we were in February when we were five seconds off in testing, we have improved a lot. These things, you always want them to move faster than they do, but I think everyone is doing a great job.

Indeed, Button has reiterated the time it takes to bring such a complicated project together, but echoes the McLaren insistence that it is making progress.

"As a team we have done a great job this year," he continued. "It is always difficult. You are at a race and you are not in the points, so people ask why you are not in the points. It does take time, but we are making progress if you look at the details.

"We were in the points in Monaco, not through luck but because we had pace. Hopefully we can carry it forward for the next few races."

Button's positive sentiments come just a race after he described the MP4-30 as 'scary' to drive in the Spanish Grand Prix.