The first version I used was one of the previews, where the IDE didn't actually work and all the code was compiled from the command line. Kylix 1.0 was "okay", but it quickly became impossible to use because Linux moved on.
The one I thought was bad was the .Net port. Delphi.Net never really got past version 1.0 of the .Net framework because, and this is anecdotal, I heard the compiler abused something in the metadata system that .Net 2.0 no longer allowed and the compiler jus stopped being able to build valid assemblies. They literally wouldn't work anymore because the class loader wouldn't load them under .Net 2.0. If you know anything about .Net, tis is pretty fundamentally poor engineering, because .Net runtimes almost always can load older framework code with the right components installed.
The one I thought was bad was the .Net port. Delphi.Net never really got past version 1.0 of the .Net framework because, and this is anecdotal, I heard the compiler abused something in the metadata system that .Net 2.0 no longer allowed and the compiler jus stopped being able to build valid assemblies. They literally wouldn't work anymore because the class loader wouldn't load them under .Net 2.0. If you know anything about .Net, tis is pretty fundamentally poor engineering, because .Net runtimes almost always can load older framework code with the right components installed.