[...] 

I am not sure yet :).

Programming is not our main use case for GT. We are using GT as an object inspector (etc) for examining diagnostic data. We have a Smalltalk application that's similar to GDB and we are using GT as the front-end.

In our world we use the Inspector and the Spotter but all of the Smalltalk programming views are hidden. GT is "molded" to be a diagnostic tool *instead of* a programming environment. Specifically, our main use case is inspecting/debugging the operation of a JIT compiler written in C. We have Smalltalk code to load binary coredumps from the JIT, decode them using DWARF debug information, and represent the application-level compiler data structures as Smalltalk objects. This way we can use GT to browse generated code, cross-reference profiler data, examine runtime compilation errors, etc. 

The "old" GT is awesome for this. I feel like this application is also very much in the spirit of the "moldable tools" thesis. Lots of diagnostic workflows ultimately boil down to drill-down inspecting and/or searching.

I don't know where we stand with respect to the "new" GT though. I am talking about diagnostics, you are talking about programming. I am talking about zeros and ones, you are talking about feelings. I am maintaining a stable application, you are talking about rewrites. I am having a hard time whether I should be switching to the new GT in the immediate future, or waiting another year or two for it to mature, or planning to stick with the old GT.

Hints would be appreciated :)

I reiterate that I think you guys are doing fantastic work - some of the most interesting work in the programming universe to my mind. I hope that this discussion is useful for at least understanding the thought process of some users / potential users.

Cheers!

-Luke