I've hired TaskRabbits for the following tasks, with the following levels of success:

Drive me from DC to Baltimore and back the next day - perfect & cheap

Assemble a Superintelligence owl costume and deliver it to me on the same day, with just a picture and a suggestion for the method - perfect

Pick up laundry from my back porch, have it washed, dried, folded, and return in in boxes - perfect

Make me an Anki flashcard deck for some faces and names from a business's Our Team page - perfect

Data entry - Good, though slow

Find me a good haircut place and style - meh

Find Toastmasters clubs nearby, schedule times for me to sit in on a meeting - okay, did most of it but the calendar invitations they sent me were in the wrong time zone so the times were off.

Find me a Rolfer - tried, but people didn't return their calls. However, I had immediate success when I made calls myself, so I have to wonder how hard they tried.

Assemble furniture, put privacy window film on windows - furniture ok, windows no

Pack and mail a bunch of books - nope. Took books, brought them back. Cost me time.