Not that I know very much, but have had a play with " a studio at home" and have bought a few bits and pieces.
Doesn't seem that bad to me for the price. Good value and 200Ws isn't too bad, but this can be a bit limiting, but not as limiting as say a 100Ws flash!
So this was useful info....
Guide Number (ISO100) - 99
f/11 at 9 feet at ISO100.
Which is probably more like f8 at ISO100 once you have the Softbox attached - Anyone with more studio experience want to comment?
One of the problems that I found is that if you want to increase an F stop then you need double the power and you quickly run out of power.
Myself and a friend have bought a couple of the "Walimex" units from Ebay. The shops are only based in Germany, but they ship to the UK for very little money (you need to tick the box to search "Europe" to see the results)
Take a look at:
http://stores.ebay.co.uk/foto-walser
and
http://stores.ebay.co.uk/Mediaresort...rafie-und-mehr
Foto Walser also have a shop...
http://foto-walser.biz/
Take a look at the "K Series", and they come in 260, 420 or 600 Ws (watt/sec) flash units.
They used to sell these off pretty cheaply on Ebay
These look more expensive that what you've found - but would be more flexible (as you can more powerful flashes it required)
The quality of the Walimex units were very good for the price, much better than the Interfit (Stella 150Ws) kit that we own between us.