My CMS has a small window in which I can edit custom HTML/CSS. It can be expanded some, but not as much as I would like. It also displays all code as dark text on a white background. On a page where I am doing extensive custom coding, it is helpful to see it in a larger window and in a color-coded display so that I don't have to strain my eyes as hard. Especially when I'm trying to scan for specific elements and target issues and so that I don't have to scroll endlessly in a tiny window.
If you're doing any sort of text editing, you should consider Vim--once you climb the learning curve, you'll be faster and more efficient at everything you do. Also, Vim is my default search/replace tool--whenever I need to make changes throughout a document, most often, I'll copy and paste into a Vim window so that I can take advantage of regexp-based replacements. Vim isn't for the faint of heart, though--it's hard to learn and super complex. If you use a text editor once or twice a month, or just need a simple way to strip out formatting, Notepad will get you where you want to go without all the confusion.
In a world of free and open text editors, Sublime Text does ask for donations. You can use the product freely with only a very infrequent popup asking for donations. You can use it however long you like without paying, but it is well worth it to donate to.
People not used to the functionality may need a bit of time to get up to speed using the documentation.
An integrated terminal would be nice, but that is just a quibble. It's hard to find many cons with Sublime Text.
This is a programmers tool. As such a lot of the features and benefits are lost on a non-technical user. To get the most out of the tool you need to have a basic crash course in how it works and what it can do. The documentation and community are good, but it takes a bit of time to get up to speed.
I don't consider the steep learning curve to be a hinderance on the overall usability. I would rate this a ten, but to be honest a lot of people do get hung up at the beginning and just abandon it. However, for people who have made the moderate effort to get over the hump, nothing can be more usable.
Never had to use their customer support before. There is ample documentation online so it's straightforward to find a solution to any problem you might encounter. For example, I needed to convert a string of HTML code to a properly formatted HTML file to "modify." Easy to do when there are so many users of the product who have needed to do that same thing before.
The support is somewhat lacking; Vim doesn't really have support outside of its forums. The forums, while notably good, aren't equal to real support though, and the steep learning curve makes you wish there was a help desk that would assist with all of the basic questions. There are several handy books and guides that can be found, and most implementations of the product come with "vitutor" which walks you through its usage.
Sublime is more customizable and one can easily modify a lot of its features. On the contrary Visual Studio only has limited customizability features. Sublime text is also very light and not bloated as opposed to Visual Studio IDE. We also chose sublime because it has much better support for the majority of languages(especially Python) and I primarily work with python.
I think it comes down to usability (and frankly, just preference). There's an old adage that Emacs is a good Operating System with a poor Text Editor! Jokes aside, when looking at different text editors, such as Emacs or Nano, Vim is the one that is usually always preferred because of how simple it is to learn. The learning curve of Vim compared to other text editors just makes it such a natural choice.