The controversial Diana memorial has finally come good despite all its problems, Birmingham-based project and cost manager Bucknall Austin claimed today.
But chairman David Buck-nall, whose firm got the job of supervising the work, admits lessons have had to be learned along the way.
The much criticised water feature in London's Hyde Park eventually cost £5.2 million - a figure announced to the Commons Public Accounts Committee.
It had been budgeted for £3 million - money from both the Government and the appeal fund raised in the Princess's memory.
"Now it is working properly it has become a major attraction," said Mr Bucknall. "Last summer there were 600,000 visitors and 800,000 to 900,000 are anticipated this coming year."
He says he is pleased that Bucknall Austin got involved in what has turned out to be a "marvellous project".
But he admits the teething troubles which plagued its early days were "disappointing".
Designed by US architect Kathryn Gustafson, the concept based on a babbling brook, was agreed by a committee containing Govern-ment representatives and friends of Diana.
"It was a bit like re-creating a mountain stream," said Mr Bucknall, recently named Champion of the Year by industry publication QS Week.
But it all went wrong when people started paddling in it when they shouldn't have, it got blocked by leaves and visitors started slipping on soggy grass surrounds.
Mr Bucknall insists his firm delivered it on time and on budget - but that was only because of enforced cost-cutting which the organisers would come to rue.
It brought about the difficulties which were to see the scheme roundly ridiculed.
Mr Bucknall says the feature was always intended to be "interactive", with, for exam-ple, youngsters able to dip their hands into the water as it r an along the granite channels.
Advice was taken from experts on safety, with, as one consequence, the granite made non-slip.
But hard paving due to be installed at the sides was cut on cost grounds in favour of grass that got soft and muddy with the numbers using it.
A vital leaf catcher was installed but again was reduced in size on financial grounds - it failed to work properly and blockages resulted.
The intention was to have wardens monitoring it in the early days, but their numbers were scaled back and so supervision was inadequate.
And an errant comment gave the impression people could paddle in it when that had never been the intention.
The Royal Parks, whose job it was to deliver the memorial, were forced to think again.
Pavement surrounds were put in place, a larger leaf catcher was installed, super-vision got better and paddling was discouraged.
It proved successful, but by then the water feature had been widely condemned as a failure.
Mr Bucknall, whose firm has 300 staff and a £22 million turnover, says the project team were "heartbroken" at the "adverse publicity".
"We have to be fairly philosophical though," said Mr Bucknall. "This was a very unusual prototype. It was a one-off. There was no precedent to turn to."
But could it all have been done better? Mr Bucknall is reluctant to join the critics.
He said cautiously: "We were certainly very well aware of the need for safety and risk analysis. We looked at what we put in place and were satisfied they were good practices.
"You can never say you couldn't have done any more. We are always looking and learning and seeking to improve the risk and safety element."
It has taken five years to get it right.
The idea began with a design competition in 2000, supervised by Bucknall Austin. Construction began in early 2003 and it was opened in July 2004. But remedial work meant it wasn't fully operational until last summer.
A source commenting on the final bill told QS Week recently: "It is what it should have cost in the first place. Everything that was cut out to get close to the budget, they had to put back in."
The hope is that at last it has put the past behind it.
But pundits say it has proved a salutary lesson in the troubles that can result from trying to provide high profile projects on the cheap.