I bought one from them for my mk4 Golf and it failed after 5 months - they replaced it for free - up to now it's fine but when it went for MOT last month one of the boot was shot so a new one of them after 8 months.
I spoke to them the other day regarding a referb on the Cossie rack and they wanted to see it after i mentioned the shortened tie rods - but.....
These are hell of a lot better to speak to
http://www.kellybraysteering.co.uk/ a little more expensive but after the first issue with my Golf i don't fancy risking for the Sierra.