We've been using Americas Mailbox since 2012, and have had zero issues. They also offer vacation forwarding, with a three month minimum for a very reasonable rate. We use the Gold plan, which is a bit higher, but we authorize them to discard the junk mail, so that reduces the cost of forwarding. They have less expensive plans, but we also get packages sent there at times when we do not know when something will be sent or don't know where we will be when it might be delivered.
https://americasmailbox.com/rates_and_plans/3/Gold