go interview, it will be good for you. but good for you for questioning the job. keep that type of questioning attitude and without being a jack-ass, go to the interview keep this attitude. but before you go, ask yourself important questions like:
do I want to be an SRO eventually
do I want to work alot of overtime
do I want to be in management eventually
do I want to live in that location
if I don't really want this particular job, do I want to use this company as a stepping-stone for a better job elsewhere
do I want to work within a union
do I need a job RIGHT NOW, or can i wait 6 mnths - 1year and find the job I really wnat
do I want to be forced to work a large amount of overtime (there is a difference at some plants between lots of OT and lots of "forced OT"
do i want to be allowed to persue my degree while on shift
$$$$$ - moving expenses, bonus, starting pay, top pay, progression expected, raises based on merit or not
pick out the most important of the above (like 3 or 4 of them) and keep them first and foremost in your mind. you can also bring this list with you to the interview and ask them all, then rate Q+A in importance later
then when you get to the interview, ask the interviewers direct questions pertaining to the above (and add to the list above things that are important to you). ask if you will be given a tour of the plant. ask if you will be allowed to talk to other operators on shift before deciding to accept. don't be afraid to ask direct pointed questions, unless you are sure you want the job. this process will make it clear whether you are right for them and if they are right for you. if they are taken aback by questions like the above, and you aren't sure you want to work there, than that in itself might be enough to decide whether you want to work there. if the people interviewing you are jerks, there is a good chance you will end up working for jerks.
don't be afriad to say no or maybe, unless you are sure you want the job. interviewing 5 or 6 different plants will eventually give you the knowledge to make an informed and better decision for yourself. if you screw up a little bit at the first interview, it won't stay with you, so don't be afraid to be bold yet respectful. A good organization should recognize self confidence as a positive, you don't want to go to a place that expects you to allow yourself to be manhandled.