I have been on Skymuster since its inception. By and large, it is not oversubscribed, but some beams are, or appear to be, at least.
But the entire system has limited bandwidth, and nbn's solution to dealing with this is to apply stringent criteria on available data allowances. As applied, this has several effects.
1. The day is divided into "peak" and "off peak". Sounds reasonable, but "off peak" is 0100-0700, which means that for most purposes, off peak data is useless.
2. Data counted is both download and upload.
3. The pricing structure used by nbn at the wholesale level ensures that while (peak) data allowances under about 50GB/mo are roughly the same as you would expect for other connections, above this costs rapidly increase. I pay about $50 for 45GB, but would have to pay $200 for 120GB - and that is the most I could get.
4. Only one installation is allowed on one premises.
5. There are no data free allowances (but see Skymuster Plus below)
These are the biggest drawbacks of Skymuster. For most plans, a Windows update to three or four computers would just about kill your monthly allowance. My grandchildren have demonstrated an ability to use 50% of my monthly allowance in one day.
Then there are the problems of any system that uses geostationary satellites. The major one is that there is an inescapable latency of about 500ms (varies a bit depending on where you are). This means that VOIP can be less than satisfactory, although some are managing OK with it.
The maximum speeds available normally are 25/5, although there is a new "Skymuster Plus" recently launched, that allows you to use whatever speed is possible, which may be as high as 50/10 - but for most uses, the latency means you won't be able to tell the difference, and the ones where it woould make a difference, such as high resolution videos or large downloads will very quickly kill your data allowance. Skymuster Plus also introduces data free allowances - but only for specified low data use items such as emails (provided there are no big attachments) and browsing (provided there are no videos) and provided you don't overdo it.
The system is generally reliable, but there have been periods when there have been outages of several days, usually the result of system updates - but seeing the whole system comes into one spot at Eastern Creek, there is the potential for a single point failure. As with most satellite systems, it can be interrupted by weather, either at your end or the groundstation that your connection comes down to (for technical reasons this will be a long way away). How susceptible it is to weather will depend mainly on your latitude, but may also be affected by near obstacles.
You need to be able to see the satellite from your antenna - if you have high buildings, trees, or hills raising your effective horizon to the north of you, a viable installation may not be possible.
In general, if you can get good mobile coverage from Optus, this will be cheaper for large data quantities, but is likely to have contested bandwidth in peak evening times. Telstra is likely to be better technically, but more expensive. All wireless options will have the advantage that they have much lower latency.
As with any of the nbn offerings, your experience with the actual installation will depend a lot on which sub-subcontractor does it, and how much experience with it he/she has. Mine took nearly all day, but admittedly it was only the second one he had done!
Hope this helps.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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