Well i noticed on www.bigcrumbs.com that you get 4% cashback for booking rooms via clicking their link to the marriott website. Is there any downside for using them? Would your rates be higher or it doesnt apply to deals/hotel specials? I noticed that after i signed up and clicked on the marriott link at their website everytime i go to the marriott website there is always a big crumbs logo on the address bar now.