[bobcostas55]

>Interactive Brokers' software is usually very solid.

That is certainly not my experience. Endless bugs in TWS over the years, and the support people are unbelievably rude. Every time I try to report a bug they start out by blaming me, it usually takes 2-3 back and forth rounds until they admit it's actually broken and tell me they'll forward the issue to the tech people. After that it's radio silence and you never know if they'll actually fix it or not.

And let's not get into the disaster that is their API...

[brobinson]

Completely agree. Their mobile app, TWS, API, and websites are all a nightmare. I left them as soon as I stopped trading on margin (the only really compelling reason to use them for a retail trader/investor).

[AndrewBissell]

I'll admit I haven't worked with their API or done anything too fancy with it. My experience is all relatively infrequent click trading, chart generation, and such.