Sorry, it's what I was trying to say (I'm French, sometimes my English is not so good). I meant nobody will complain if they fix a compressor that doesn't compress, but if they upgrade a virtual amp in order to make it possible to saturate it, some people may be annoyed even if the new version of the virtual amp is more realistic, because they may prefer to stay always clean and all their presets may suddently change after an upgrade. Imagine you upgrade just before a gig and suddenly all your presets sound distorted? Just wondering…
Fractal Audio leads the way with firmware updates. They offer significant updates more often than some people change underwear.

It seems like the vast majority of Fractal users appreciate the frequent updates. No doubt, they are extremely pro-active about de-bugging beta release firmware and indulging their user base with wish-list items - unless you're a bassist, of course.
Typically, the best practice is to do a full system backup of your current unit's firmware version 0.xx (presets, IRs, global settings, pedal switch layouts, etc.) before doing any firmware updates, and keeping a running list of the firmware versions (and computer editor versions) in a folder in the event you want to revert to previous firmware/presets/system settings when a new firmware borks your sounds (which can and does happen when models are updated).
Depending on if you're a gig-heavy performer, studio session player, or home punter, your desire to do a firmware update will vary. Some users jump on beta releases and assist in de-bugging, while others (like myself) will wait on firmware releases and only update when time allows, the firmware is stable, and when the features offered in new firmware have significant meaning. If it ain't broke, you don't need to fix it.
I remember when effects would roll out an update that not only required the user to PAY, but also required a physical chip removal and replacement, and you were lucky if it happened only ONCE for a given piece of hardware. IMO, the new trend of downloading new firmware is of tremendous value.