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Certainly, press checks are optional and depend on the complexity of your job. Off-press proofing is so consistent and accurate today that pre-approval by that means may be a viable alternative in most cases. However, if you are interested in a press check, you will want to discuss the printer's policy regarding them at the time of quotation (re: cost per hour for press time, time limits, delay charges, etc.).
It is good practice for you to suggest a press check when you produce a job which:
Some people think that asking for a press check signals mistrust of the printer. On the contrary, a press check can ensure a close working relationship through the final stages of production.