Had all my cars converted over the past 25 years. Not one of them ever gave me a moments worry and my bank account is better for it.
My LS400 was converted by Andrew at Profess Unit 2, West Road, Penallta Industrial Estate CF82 7SW Hengoed
Telephone 01443 812893problems.
I have never had any sort of flash lube fitted on any car as there is just no need for them, just a way of the don't care fitters to get another £100 or so out of you.
I think Andrew is charging £1000 + VAT and he will lend you a car while they install your system in a day.
The work is neat and very professional.
My present LS400 was converted by Andrew 11 years ago and its done 100,000 miles, all without a moments worry.