I have bought recently a BD player, BDP-S590 model and I can't read movies subtitle because the subtitle font size is too small. I don't find any setting to increase the subtitle font size, even after I made the firmware update. This is a major impediment to watch movies.
I didn't pay the price fixed for the BD player SONY BDP-S590 to spend my free time editing subtitles! If the SONY Company is not able to fix this problem with a firmware update, I will decide to return back this BD player to the shop from where I bought (after that I will write on his site about this problem to prevent the costumers) and I will look to find another product.
On the internet I found information about some models of BD players produced by Samsung or LG which allow you to set subtitle size in three steps.