This site is a legit site and they won't be doing anything bad because they are not the ones who is opening up signature campaigns, sites outside of the bitcointalk are the ones responsible for payments and handling them. Also in the past months handling the sites who never pay is easy by having a reliable escrow can confirm that they handle funds for that campaign, they give you assurance that if even the campaign promoter runs aways the escrow will still pay you with the funds left.