Perk is working really well for me. I’ve earned another $5.00 (I have three phones running it). Though I’m still in the hole because I bought phones for the purposes of running Perk TV (see here, and here), that hole is smaller now. The total phone cost I incurred to maximize my Perk TV earnings is about $57.00 and I’ve already earned $10.00 back running three phones. Two phones should arrive Monday so I should be making something close to $5.00 a day if all goes well.
Perk it awesome and I highly recommend signing up, especially if you have an old iPhone or an Android 4.0 or higher lying around.