RFR Adjustable Stem

[Fartomatic5000]

Hi folks,

I've just ordered one of these, to aid with getting comfortable by raising the bars a little.
http://www.amazon.co.uk/RFR-Adjustable-Stem/dp/B00...

Has anyone used this particular one? If seems that some adjustable stems (from other manufacturers) have a problem with play even when torqued correctly. My main concern is safety, maybe I should find the best angle for me, then switch to a fixed stem, or are adjustable stems ok to use long term?

[Fartomatic5000]

I don't know yet as it hasn't arrived... the current stem has very little angle, so flipping that isn't going to work.