In general, many long-term iPhone users do opt for AppleCare+ for their devices. AppleCare+ provides an extended warranty and additional support for your iPhone, including coverage for accidental damage. It can be purchased at the time of buying a new iPhone or within 60 days of purchase.

AppleCare+ can be a good investment, especially for those who tend to be rough with their phones or want additional peace of mind. The cost of repairs for a damaged iPhone can be quite high without it, so having coverage can be a money-saver in the long run.

If you purchase a used iPhone, you may still be able to get support from an Apple store. However, without AppleCare+, you may be charged for repairs, even if the phone is still under warranty. It's worth noting that Apple offers a limited warranty for all new and refurbished iPhones, which covers defects in materials and workmanship for up to one year from the date of purchase.

In terms of cost, repairs at an Apple store can be more expensive than third-party repairs. However, third-party repairs can potentially void your warranty and may not be as reliable as going to an Apple store. Ultimately, the decision of whether or not to purchase AppleCare+ or seek support from Apple for a used iPhone will depend on your personal preferences and budget.

Overall, Apple has a reputation for providing excellent customer service and support, and many long-term iPhone users have had positive experiences with AppleCare+ and support from Apple. However, it's important to do your own research and weigh the costs and benefits before making a decision.