My IRR after several years is around 6.5% and has been very consistent. They quote a "return" of around 10%, but you know how these companies (LC, prosper, ...) always create some funky return measure which doesn't line up with the more critical IRR.
I should note that there are some serious differences between groundfloor's real estate loans and the LC and prosper consumer loans. These are loans that are paid off in one lump at the end, not monthly amortizing like LC and prosper. So the first time you get a real indication that you're not gonna get paid on time is at the end of the loan, usually 1 year after the origination. The next difference is that it takes a LONG time to resolve what happens next. GF creates some workout scenario, and that takes a few months, and may be extended multiple times, and then if you're not paid they start foreclosure. Foreclosure can take a very long time, depending on the state. Often more than 1 year. Then the property has to be sold. So it takes a very long time for the bad loans to get resolved. The really good news is that once foreclosure is complete, you almost always get most of your money back, because these are collateralized loans. Whether you take a significant loss depends on how well GF figured the value of the property before making the loan some 2 years or so earlier.
This has worked out well for me, but you gotta understand how different these loans are from LC & Prosper, and you gotta have patience.