Here’s the Deal
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They had a GUI architect tool, but that tool never was up to date with the current framework version. Now they even seem to have abandoned the whole architect app. Also, to build a ExtJs app you have to use their tool (and then you have to pay, from that moment ExtJs is no longer GPL). But this tool also has lots of bugs. See More
You only get a limited premium questions that could be answered via the support and if the issue is too large then you might lose all your credits (it has a credit system for support) in one question. In addition the replies in premium forum are sometimes less thought of than you would get in stackoverflow. See More
That ExtJs is expensive is not the problem, but what they did is started completely free, then switched the licensing model when they had profited from the community. Also, they suddenly switched from a single user license to a minimum of 5 users. See More
ExtJS is free for use in open source projects, but you have to use the unstable version which is riddled with bugs. Furthermore, to build a project (even if it's open source), you have to buy their proprietary tools. For commercial projects, it costs $665 for a license. See More
The community is very small and this is because the licencing is very expensive. Therefore not many people to test the framework and give feedback in order to fix. They try to do everything in house which means that a small company (linkedin shows about 100 employees) tries to imitate something very large. The scaling problems lead to lots of bugs and instability. See More
There is a large amount of source code that can be useful and indeed all the samples works flawlessly. When you try to get into more complex scenarios you will find yourself in situations where things just do not work as expected. You will have to do manual work. See More