A friend of mine was hired back in July and asked me these same questions. Many said “don’t bid WB, you’ll be stuck commuting to reserve minimum 2 years and won’t have a line for 5 years if you stay on it.” He went 777, was on reserve 1 month, got a line his 2nd month, and can drop his trips at will. Takeaway: gather as much DATA (not opinions) as you can and make your own decision.