No problem I wish someone had told me that stuff but I had to find out the hard way. Also more expensive is not always better. Unless you have a ton of money to gamble with, stay away from the ones that cost 1 or 2 sdb because they don't work that much better. At least not enough to make them worth the price.
Some of them take a little while to come through. Bestboom can take up to an hour or two (I think it is so their vote power to recharge a little). Hugo4u is pretty fast but it costs .7 I tried one the other day and it got me some good upvotes. I'll check my transactions and add the name as a reply.