Everything Big Dog says matches up with my (much lesser) experience. In short "weather is where you find it", and unless the bad stuff is right over the field, it usually pays to at least go up and have a look. This is particularly true during the summer, when 95% of the time you can stay VMC below the overcast and pick your way through the storms.
ATC is almost always helpful. Sometimes a little too helpful, since they're used to RJs wanting to stay 20 miles away from the nearest rain shower, and therefore want to send you home by way of Timbuktu. On the other hand, I once broke out of an overcast about a mile short of flying in to the middle of what had to be at least a level 5. One of those really concentrated summer cells about 5X5 miles, and nothing but showers on either side (it was one of those days the midwest got clobbered by tornados). Controller didn't say a word (to be fair, he was very busy). The moral of the story is be wary of embedded storms. They're pretty much the only weather that still gives me that wonderful buggy-eyed alert feeling (as opposed to the slap-yourself-to-stay-awake feeling you get every other day after month 11 on the same run).
We have a couple of airplanes with strikefinders. As far as I can tell they're mostly just good for scaring the everloving turds out of yourself. Maybe ours are a bit "oversensitive", or I don't know how to use the thing, but I eventually just turned it off, since it spent most of the time doing a good imitation of a christmas tree.
FLX runs are about 80% daytime, I think (I vaguely remember that figure from training...if that's wrong, it'll be more than 80%, not less). It seems like they just operate the company as though you were based at your destination rather than your actual base, if that makes sense, which keeps people flying during the days and also makes lots of very long duty days (good for the $$).
As to the DO playing favorites or going out of his way to make anyone's life unpleasant, I haven't seen it. Ernst is what I'd describe as "tough but fair". He'll definitely make clear to you exactly how much your screwup has cost the company in excruciating detail if you ever have to do the rug dance (for example, if you suddenly need a day off you could have asked for three weeks ago, but didn't, and now he has to charter the run...not that I'd know.) But he doesn't hold a grudge and understands how hard you're working. If you give him fair warning he'll to his best to help you out. It probably helps if you manage to show up for work on a regular basis and don't start unneccesary drama at FBOs and soforth. My lord I'm longwinded. In short, it's not real hard to get along here and stay under the radar.
Finally, FLX also offers a $1000 ($78something after taxes, I think) bonus. If you stay 6 months you keep it, otherwise, you can just keep the check and send it back to them when you leave. This is in lieu of a training contract, which FLX does not have. If you get Nashville or St. Louis, you can live in the hangar for free (you get what you pay for...especially, I hear, in Nashville. Dormitory style living.) One of the Florida bases also has hangar beds, I think, although I'm not sure which.
Not to get in to a bidding war for your future attentions...my only interest is that of a relatively happy employee. Ram and the other operators definitely have things to offer that FLX doesn't. To each their own.
Good thing I have all of this time on my hands, I'm finally writing that dissertation on the internet.