I have used the Fisher & Paykel HC405 Nasal Mask for over 8 years now. I have tried a variety of other masks as they have come onto the market also but nothing compares to the reliability of the F & P HC 405. The only fault I find with them is the clips that retain the grey sliding piece that holds the headgear in place on the mask become brittle after about 15 - 18 months and will break and so yo will need to purchase a new mask which is a bit annoying.
Apart from that, i find that it does not leak like other nasal masks and is extremely comfortable. A tip also is to leave the velcro up on the headgear and unclip it from the grey sliding piece as the velcro headgear will wear out in about 3 months if you undo it that way and it works out quite expensive to replace the headgear 3 - 4 times per year.
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