I hardly boot into windows now a days.

So I only use it on Linux. It's great

I never used kylix because it never ran for me on Debian.
Compared to Delphi, it still needs work, but it's very usable.
I never worked with Indy, not even on windows (I used ICS on windows), now I use Synapse which is very nice to use.
The code and compiling are as fast as windows.
The only draw back is the size unfortunately

But upx helps a lot

Since I mainly work with fpc to create console programs as a hobbyist programmer, I miss DevPas which is very nice.....
But I work with scite as an editor (love the highlighting it has), and compile from console

I'm so glad that FreePascal and Lazarus are around so I can keep on learning.