Mike
I run JustData at the moment: have done for two years.
Am trialling Premiumdata. Slightly dearer.
Both provide Metastock format.
This is '"fiddly" to set up for all first time users with Amibroker but this is the same for any MS data supplier, is once only for each database.
JustData can also export to ASCII ,which files are more Readable.
By this I mean that unless you have the MS downloader you may not be able to read which tickers are in your MS database, if you wish manually adjust,delete etc.
JustData is more complex software: so another learning curve.
But has got more options such as choosing to export with/without reconstructions/dividends etc.
Probably Premiumdata is more straightforward.
Support for both, I think, is equally good.
Justdata also provides some fundamentals in its own format. I will trial this over the next few weeks because if we can export this to ASCII as per website,...
http://www.justdata.com.au/Training/Tutorials/Features/ascii_format.htmthen we should be able to read that, including GICS information, with Amibroker, but I would need help with that.
Overall I think premiumdata is simpler, if less configurable, and you would spend less time looking at data management.
Their indices have volume, if you use this. Justdata don't.
Another thing with Premiumdata is delisted tickers get saved in a delisted folder, so for backtesting you could access these.
Justdata allows removal of delisted tickers, but you cannot easily save or retrieve them.
Just the way I see these two providers.
Regards
ChrisB