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I'm hoping there is a WOTC person out there that can answer this definitively:

Level 8:

NIGHT CRAWLER
You gain a climb speed equal to your speed. You can climb across a ceiling or similar surface. However, if you end your turn on such a surface, you fall.

My question is this... do you still need to make a successful climb check? 

Thanks in advance!

No.

It says so right in the entry for climb speed:

Climb Speed: A creature that has a climb speed, such as a spider or a carrion crawler, doesn’t have to make Athletics checks to climb. It can simply climb up and down a surface using its climb speed, doing so as part of any of its actions that involve it moving. In addition, the creature ignores difficult terrain during the climb and doesn’t grant combat advantage because of climbing.