Lucky to have two in my collection.
A 353601 which I think is the definitative GST model, tends to be my every day watch, I find the ti light and comfortable on the wrist, however no micro adjustment but does have the iwc easy sizing bracelet. I've only seen another one in the wild on a few occasions.
Also have a 353703 which is the silver dialed GST with the alarm complication, SS does make the GST wear differently more top heavy but so much that uncomfortable, the silver dial and gold hands work well which seem to have a warm feel to them and can look almost white in some lights.
Apologies for the poor photos