Dude, it's like totally free! You can do your research on TOS but send limit orders via RH. In case of emergency hedge via TOS or whatever. Front end is not the important part ... Backend is where the magic happens. They are the future of retail brokerage. Soon you will have no choice unless you do lots of volume.
The "free" pricing model may or may not be the future, but how and what RH chooses to emphasize about the service tells you a great deal about where their priorities lie as a business.
Instead of: safety, security, conservative / risk-averse business practices, robust systems and infrastructure, deep industry knowledge and experience, integrations with pro trading software and systems, service offerings suited and geared to pro or aspiring pro traders, etc. we see: "free" (ie opaque) pricing, "trade from a smartphone app", service geared and marketed towards unsophisticated novice customers, arrogant millennial tech bro culture, executive team with minimal or no background in trading or markets, growth and "disruption" as the overriding business focus, and a flippant attitude towards compliance and regulation.
It's all fine and good to play around with a few bucks on your phone, but when it comes to my serious trading business I'm staying far away from them.