I have had a Tastyworks account for a year, and I came close to transferring it to eTrade this morning. It was the commissions comparison that stopped me.
What frustrates me though is that it takes Tastyworks forever to roll new features out. And there are never any target release dates. It's always "soon," which could be a year or longer. For example: I want to trade options on commodity futures--for me and this market, I believe that is where the opportunity is. That will be available "soon."
They put more resources into producing video content than in their software development, though I wish it were the other way around. Don't get me wrong, I love their options studies and most of their shows. But after awhile you get tired of hearing Tom and Tony bemone about how untradeable this "improbable" bull run is . . . . month after month, year after year. You get sick of their stubbornness for holding short delta on equity indexes because the market has to come down eventually.
Their trading platform is solid, with fast execution. It is clean and great for setting up strategies. But if you like bells and whistles, there are none. If you like to feel like you have a lot of analysis tools at your fingertips, that's coming soon.
Anyhow, that is an honest assessment from a Tastyworks trader. I hope it helps. I am optimistic they will get to the level of features I need, and I am sticking with them for now. But it is slow going.