The best way to find out about good companies is to ask people who have planted for them and want to return. If you have a friend or acquaintance whom you trust and share views with, chances are that the company they recommend will suit you to some extent. Any good company will put you in touch with their experienced planters so you can ask questions, get advice, etc. It would be unfair to advise prospective planters not to trust foremen and other non-planting personnel. However, bear in mind that those who are recruiting planters are going to put the best spin on things that they can.
Size is also a good indication of company quality.
Generally, the bigger the company is, the less lucrative the planting. The larger companies hire mostly rookies, who, because they have no experience with planting and who can be conned into signing rip-off employment agreements, are easily pushed around. The best really big company is Brinkamn and Associates. Really nice folks, very well organised and very experienced staff, as well as long seasons. But not always creamshows.