I have used Toad since 2001, (maybe version 7.3) and keep it high as my favorite tool for oracle related work. I'm no DBA, but a developer.
The biggest change, I think, came with version 9, when they left behind the old code base (i think it was developed in Delphi, or C++. ), and started writing on .NET
Naturally, lot's of bugs and crashes in the early 9.xx versions.
After some time, most of them were fixed, stable version came, and the process of "enriching" continued.
On version 10.xx I saw some substantials changes in the look-and-feel.
different data grids, different filtering, different editor.
Along came new signs of un-stableness.
I installed v.10.5 and deinstalled it after 2 days.
I'm happy with the 9.75 version, which is pretty stable, and very rich in features (70% of which I dubt I use), thank you very much.
I'll wait one more year for 10.x to mature, and maybe then, if I have time, I'll give it another try.
That's my advice. Keep using 9.7x and you'll be just fine, if you dont want to learn some new tool to do the same (or, less work).
On the other hand, I bet my (whatever), that 95% of Oracle DBA's and PL/SQL developers of this world, would be perfectly able to do their everyday job with Oracle's SQL Developer, and do not need all those advanced features that Toad has, and SQLDev doesn't.
(this I write it for whoever has not used any of the two. People that are used to toad, maybe wont like to learn another).
anyway, sqldev thelei polla psomia akoma gia na ginei toad sti thesi tou toad :)
The truth is that every year Quest keeps adding features and functionality, and eye candy, and has balloned a very useful admin/dev tool to a humongus suite.
The case is similar to Microsoft Office: 95% of the people that used MsOffice 95 to do a set of X things, uses today MsOffice 2007 to do the same things, at the same speed (although using CPU's a thousand times more powerful than 1995). And half of them are ready to order Office 2010, because they "need" it!!
That's the fate of succesful commercial retail software. It does not matter how good, or stable, or snappy, and bug-free is a specific version.
When it completes its commercial lifecycle, a new version must be produced, to keep the ball moving.