i use tastyworks but it's not my primary trading platform so i'm not a power user. it runs on java so it
will run on different operating systems. it's fast, stable and has very good support. commissions are good,
everyone gets the same commissions: options are $1 per contract to open, $0 to close. they cap
commissions at $10 per leg.
they have limited analysis tools, you can plot the risk graph but only with the same expiration. when you try
to analyze a calendar or diagonal they only plot the farther out expiration. there's no "what-if" analysis
capability. if you're looking for analysis, scans or charting similar to thinkorswim you'll be disappointed.
they don't have trade automation capability, only the basic order types. order entry and management is
easy. the platform doesn't have a lot of customization options but what they have is adequate. i like the
platform but if i didn't have other tools for modeling and tracking i would not be able to trade they way i do.
my opinion, anyway. fwiw.