regarding quality...
Admittedly iStock has some of the nicest material, but many of the images are exactly the same. So... case in point... go to iStock and say I need a pic of a bike on the beach. Found one, and the large size sells for 10 credits (which are $1.54 per credit). So the image would cost me $15.40 (but I would have to pay $18.50 to buy the minimum 12 credits).
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But lets see if we can find it elsewhere...
Fotolia has a number of image from the series (and most likely the same one if I looked hard enough). To buy a large image, you would need 7 credits, or $8.40 (you would need to buy a minimum of 25 credits for $30). So, roughly half the cost of IS.
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Dreamstime... same image... large sells for 11 credits, have to buy 13 credits... so it would cost $12.68 (have to but 13 credits for $14.99).
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Now on to 123rf.com (which now occupies the same 1-2-3 dollar niche that iStock abandoned, lol). Large costs 3 credits, credits are one buck (how refreshing... each credit costs one dollar). I have to buy 15 credits, for $15.
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So... should you choose iStock? Sure, if you absolutely need an image that only they have. But, why buy one image for $15.40, when you can buy the SAME image for $3? Or, put another way... buy one image, or five for the same price. Your choice. If you buy only a few images it likely isn't a big deal. However, if you buy a lot, it is a big deal. I dunno... spend an extra $2-3000 on stock, or use that money to buy... a new workstation, iPad, printer, etc. When it is your own money, it becomes a bigger deal. Every dollar saved can be the easiest dollar of profit you make....
cheers,
michael