The UK's Telegraph Magazine said this of SU-DO after they sent someone out to test a few different systems:
    "Most spray on tans are still too orange, too apt to go streaky and feel way to sticky.
    But after rigorous testing, I can reveal that the following salon self tan, SU-DO is worthy of a mention."

WHEN TO HAVE IT: Pre and post holiday: if you are fair and want a darker - but still natural tan.

WHEN NOT TO HAVE IT: When you want a complete skin-prepping treatment that includes exfoliation and moisturizing just before going out in a revealing outfit (the tan carries on developing for a few hours after application).
SU-DO advises against it when you are pregnant, because your skin tone changes and this can affect the final result.

• A tan is only as good as the canvas, so exfoliate well first, paying close attention to knees and elbows.
• Relax your face. Screwing up your eyes will only result in unattractive white crow's feet
• Keep palms unsprayed by holding them horizontal to the floor, or turning them inwards to face each other.
• Do not wear white - of anything as it can stain