They're fine for buying a turnkey, older home that gets "spruced up" and comes with a 1-year warranty on their repairs. Especially if you don't have the time or know-how to do it yourself. It's the one-year required management agreement at 10% that can get you (although you can re-up the following year at a discount if you pay the entire year at once).
What you definitely need to avoid is leasing through them, should your property become vacant. See, it's a snazzy start-up where everything is remote (besides their main office in SF) and they got da fancy "algorithms" & da nifty "machine learning" with a coefficient quadratic equation here and a pythagorean theorem there that tells them what rent should be and tenant profiles you should look for. Say you got a neighborhood in suburban Georgia with a certain type of industry in the area, well, okay, cool, but you're gonna have a 24-year old recent Berkley graduate still living with their parents to manage the property! Because see, they've got a script & the software to tell them how to respond to tenants & owners, what the cost of a repair or appropriate vacancy rate should be, etc... see where this is going?
Without proper boots on the ground, your property will never get the proper love & respect it truly deserves (I get it. It's an investment. It's a dollar figure on a spreadsheet. But it's also A HOME). If it sits vacant for months at a time, the data model gets recalibrated and they'll tell you to lower your rent calibrations, but maybe what it needs is someone to tell you "you know what? yellow walls don't really work in this city" or "actually, there's a bottomless pit in the front lawn that is putting people off". But because Doorvest relies on a Zillow feed to feed their data monster, they may not know you have a portal to the 7th layer of Hell located on your property. "It looked fine on Google Maps!"
So... if I were to advise a friend, I'd tell them, sure, if you really wanna buy, this platform is fine, just like Roofstock is fine, if you really don't have a team built out and trust built in to find better deals & opportunities. But please for the love of all that is good, plan your exit strategy with their property management, because that has been a giant dud for me and do not see it getting any better should they continue the hands-off, digital approach to placing & managing tenants.