Avoid it!
This was the first time I tried SMM Panel. I thought I would start small, paid 12 USD and ordered 10 300 Twitter followers. It started well at the beginning, but at about 3700 followers the process stopped.
I opened a ticket, got this response:
"Order placed : 4 days
Expected Delivery time : 2 days 44 minutes
Order is taking longer than expected to be delivered - this can happen due to high load on this service. We are investigating the issue."
I waited for a while, and as there was no further reply about what was going to happen, I asked for a refund.
They stopped the process, and the dashboard showed that 8.76496 USD had been spent and 2,744 followers were left to complete.
Well there are some serious math problems here, I indicated this again in the tiket. They forwarded the problem to the marketing department. The reply was that they had delivered 7,556 followers, but this is simply not true.
I know it's not a large amount of money, but I expect to get what I pay for, or if they can't deliver, to refund the money.
This story is over a week old, I have let it all go. But if you don't want the hassle and a completely unnecessary expense to yourself, avoid them!