Bought 34-40 for my Mage.
Yes, they are cheap (£9 or $1 for 34-40 they are not very subtle though. I wouldnt recommend using them on your main account.
They told my friend that I was power levelling and I told them off for that so they apologized for it and said they would fire the leveller :O so i was like nooo it's not that big a deal I don't want someone to lose their job over a level 40 Mage. They were like "you are very kind i tell him you save his job".
I told him not to tell people he was levelling me so he said OK and he put DND on.
Level 39 and not banned yet, they are fast but they don't exactly try their best to keep your account safe.
They seem ok for short levels. Wouldnt reccommend a long term level though (Like anything over a few days)
I'm not sure whether they use bots I don't think so because there's always someone talking when I whisper them and they seem like very nice people.
Got my Mage to 40 and no ban Also got me a few pieces of gear from SM. Whitemanes Chapeau and Hypnotic Blade
Edit: Banned! For "Involvement in online trading activities" maybe that means the power levelling but I have account traded before on it so might mean that... 3 day ban and final warning (I was already on final warning rofl)