That's why I asked the poster why he thinks it sucks. I've never heard anyone say that before. I havent ever used 3.9 yet (3.1 is the newest I've used) but it looks like it has many more features.
Are there any backwards compatibility issues with 3.9 (other than requiring 3.1 ROMs)? Do any programs or hardware not work with 3.9? I have an A1200 accelerator (CSA 12 Gauge) which I hear has some issues with 3.9, but I'm not using it in the machine that will get the upgrade (and I think the problems are a minor thing that only affect the craptastic non-DMA SCSI on the CSA).
Is there some kind of design change that bugs you (the person saying it sucks)? Do you just not like it because its a post-Commodore OS and not "authentic"? I'm really curious.
I likely will install 3.9 anyway on the one machine with new enough ROMs, but I'm wondering why someone would prefer 3.1 to 3.9.