Are electronic collar-activated pet doors worth the extra money?

Specialist-community consensus on r/dogs and r/smarthome is that collar-activated doors like the High Tech Pet Power Pet line do keep wildlife and stray animals out and are genuinely loved by owners who need selective entry, but multiple high-trust threads flag that they are expensive, can be noisy, and on some units the panel stays open long enough for a second pet to slip through. If your only goal is letting your own dog in and out, a simple flap door costs a fraction as much.