It's been 12 years since they were discontinued, but it was one of the best-selling phones ever, with more than 126 million having been shipped back then.
Relatively tough (and probably very tough compared to most modern smart phones) they can take a fair amount of abuse, and with standby times of about a month and around 22 hours talk time they beat just about anything else hands-down.
I might even get one myself this time around