Would you rather have a candidate that runs as a conservatives like W did and then spends more money than all presidents combined before him while overseeing the biggest expansion of welfare since the 1960s? If Trump had not gotten in the GOP-E was going to use the tried and true formula of letting the conservatives snipe each other off to get JEB in just like they did with Dole, McCain, and Romney. Trump has at least disrupted that plan and brought up issues the GOP-E would sorely love to ignore like our border disaster and how we always get screwed on trade deals the crony GOP-E loves. I do not know how Trump will end up but if he does get elected and only secures the border, gets rid of criminal aliens and disappoints on everything else he will have done more for the USA than any president since Reagan. I personally want Cruz to win but I would feel better voting for Trump than I would for JEB, Graham, Rubio or just about any of the other amnesty supporting candidates.
Everything else including immigration he will screw us on if he gets into office (of course everyone else will screw us on immigration also, since no one is willing to actually deport the 20+ million illegals here)