I am not a heavy user of spreadsheets, but I need them from time to time, and I have always found Excel not very pleasant, despite its powerful features. Quite often, I was going back to AppleWorks, and then completing the work in Excel.
Tables has solved my problem and provided an elegant substitute. I bought it once it got the ability to export to Excel. And export works well: I do all the work in Tables, then export the finished work to Excel, without any problem.
What I like is that Tables is that it is rather easy to use - there is a learning curve for people like me who are not very comfotable with spreadsheets, but it is not steep, and I assume there is no learning curve at all for somebody who is more familiar with spreadhseets. Moreover, Tables offers a very pleasant environment, Mac-like: I had tested the other spreadheet applications for Mac, none was as easy to use, none provided the same comfort and elegant, uncluttered, bright environment. Thanks to Tables, I find spreadsheets much less intimidating than they used to be!
In addition, I should mention that support is top quality. Each time I asked a question, I received a courteous, precise, detailed reply from the developer a few hours later. Always very helpful, taking time to explain even simple things which I had not understood properly.
Regarding stability, never any problem. Once again, I am not a heavy user, but from my own experience for the past two months, I can only praise that application. There is still some room for improvements, but, for all people like myself, who need spreadsheets from time to time but want a simple, understandable environment, I have the feeling that Tables is on the way to become THE right solution on the Mac.