As finger pulse oximeters go, this seems to be a pretty good budget model for what it offers.I have compared it's SpO2 readings with those from two more basic models and found it to be typically 1-2% less than an Elera-X1 and 0-1% higher than a TempIR-oxy, so generally in the middle which seems reassuring.Uploading to a PC is straightforward enough after the first attempt. Viewing the plots of SpO2 and PR is good, though useful understanding the analysis reports is beyond me at this point, being something of a novice to this subject.Battery usage is quite high. Using two rechargeable AAA batteries, the battery low indicator was flashing after a 9 hour use period. With non-rechargeable batteries, cost could add up quickly, especially if one wishes to ensure a full night's recording, which would generally mean starting each night with a new set of batteries.The main lack I have found in this budget oximeter is perhaps a real time clock as I find myself, when viewing the plots, having to continually translate the time since start of recording to real time of night.Possibilites for buying oximeters with real time clocks seem very limited unless one is to go to specialist medical suppliers and pay high amounts, and the only readily available oximeters for the consumer here in the UK seem to be the various Contec models. Consequently I have now ordered a Contec CMS-50I.