TL/DR: I think they would be good for you since you are looking for running errand shoes and not walk-all-day shoes.
Here are my detailed thoughts: I debated Rothys for months--I have fairly severe bunions, and I've never found a ballet flat that can accommodate my wide forefoot and narrow/normal heel. Most ballet flats are so painful that I cannot walk more than a couple of steps in them. I've never owned a pair in my life.
Lo and behold, I was gifted a pair of Rothys recently ("The Flat" style; white, grey and black camo pattern) and...they are great!
The size 8 "Flat" style fit my 7.5/8 feet very well with *no pain* in the toe area. The back of one rubbed a bit, but after 3 days of full time wear (for reasons I won't go into), it no longer rubs. The camo pattern goes with my usual bottoms (black ponte, white jeans, dark jeans). The shoes are adorable and disguise my distressingly unattractive bunions.
I subsequently purchased "The Point" in camo red. They are adorable and surprisingly versatile. I sized up to an 8.5 and they are comfortable and stay on my feet (so: 8 in The Flat and 8.5 in The Point).
The Rothys don't feel very supportive (I think an insole would help--I just have the insole that came with the shoes), but somehow my feet (and back) just don't hurt, and I've walked all over the place (no hills). Sneakers and booties are more padded and more comfortable.
So, thumbs up (way up) from me.
When you buy a pair, they give you a code. Mine is ADHFQ2W. I think if you use that, you save $20 and they give a discount off my next pair (if I buy another). So use that if you like...and hope this helps.