Why they are rarely blocked
Blocking a residential range means blocking real customers. Sites know this, so residential addresses get far more benefit of the doubt than any hosting range, which is the entire reason the category exists and the entire reason it costs more.
The trade is speed and price
Traffic goes through a real consumer connection, so throughput is lower and less predictable than a data centre link. Billing is per gigabyte rather than per address, because what you are buying is passage rather than a machine.
Rotating and sticky both available
Rotating gives a different address per request, suited to crawling. Sticky holds one address for a set window, which is required for anything session based. Both are available on the residential pools over HTTP and SOCKS5.
Targeting down to city
Country targeting is standard, which matters for local search, regional pricing and anything that varies by market.
What to buy
Buy residential when datacenter gets blocked, or when the data you want is geo dependent. Metered, per gigabyte, and it does not expire.
Common questions
What makes an address residential?
It is assigned by a consumer internet provider to a household rather than to a server. That is the whole difference, and it is why the class costs more. A site that wants to tell visitors from infrastructure apart is looking at exactly this, so a residential address carries trust that a datacenter address cannot buy at any speed.
How long can I keep the same address?
Up to six hours here, or you can let it rotate on every request. Hold a session when the work spans several pages that must agree with each other, such as a cart or a signed in flow. Rotate when each request is independent, because rotating spreads the work and keeps any single address from carrying an unnatural pattern.
Is residential always the right choice?
No, and it is the most over bought pool for that reason. It is the right choice when the target inspects the address, and an expensive habit everywhere else. If a datacenter request already succeeds against your target, residential buys you nothing except a larger bill.