I'm about to order RME Fireface UFX. Anyone got something to say? Talk to me.

Have a UCX ( similar ) --been very happy and RME driver stability is excellent. Totalmix simply works as it needs to. Happy RME user here. Good luck on the decision!

Hi. I have the Ucx, the little brother.
I am very pleased with it. Low latency, and super stable drivers.
I use mine over USB 2, with no issues at all.
 
@ Pragi Not sure if it works over TB, but USB(2) will not be a bottle neck.
Unless you are recording a massive orchestra, with all separate mics..
All the best.

Blix : If you use it using the 1 x FireWire 400 port it will perform quite well ...but do keep in mind everything has gone Thunder Bolt lll and the power of that port is to die for..and is the standard !  good luck

The only minus point I can think of is the aging FW interface. If you don't mind that, everything else is top notch. TotalMix FX is a joy to use. I even use my UCX with iPad control as a live mixer for a three piece combo (stereo keys, synth bass, kick/snare/2xOH, acoustic guitar and 3x vocals) with three stereo in ear mixes and a FOH mix.

Pragi
 
My question is more based of the future compatibility
for the next 10 years.
Spending  that much money for an audio interface
means to me that I like to have that unit as long as possible.
 

I don't think I will ever need a new AI. But if I do (for some reason), it will be another RME.
RME supports devices over a decade old.
They even updated (firmware for) some older models to take advantage of the "new" TotalMix. 
I cannot remember hearing ANY horror stories about RME ever.

Sanderxpander
The only minus point I can think of is the aging FW interface. If you don't mind that, everything else is top notch. TotalMix FX is a joy to use. I even use my UCX with iPad control as a live mixer for a three piece combo (stereo keys, synth bass, kick/snare/2xOH, acoustic guitar and 3x vocals) with three stereo in ear mixes and a FOH mix.

This is not a problem at all. I don't use firewire. I am using USB 2 and like I said I can record 30 tracks at once with no problems using USB 2. The UFX Plus can also use USB 3. These devices are not limited to firewire.

I have an old FF800 that has never had problems. As others have said its rock solid and they still write drivers for it. Good converters for the price. If my FF800 died I would most likely get another RME interface. -Jim

I've had the UFX for years and it's been solid and before that I had the FF400 which was just as solid.  The FF400 is still working well with RME keeping the drivers updated.
 
 

RME Good.

I love my UFX. It's rock solid, sounds great and very versatile. I'm sure I'm still not using it to its full capacity. The only issue I've had with it is an XLR connection getting stuck. I am unable to remove it. It's still in there but it's a hassle and cost to send it away to get fixed and also a time out recording-wise. Of course I could temporarily go back to my Roland Quad Capture in the meantime but I like products that work consistently and where you received constant updated driver support...wish I could afford the 'plus' but maybe when I sell my car. lol

Pragi
Are the firewire RME interfaces  able to run via a  thunderbird port?

They certainly run very well on a Mac Thunderbolt port using Apple's Thunderbolt->firewire adaptor and a firewire 400->800 conversion cable. Don't know whether that would work on a PC though. Not that it's a problem, the Fireface UFX works equally fine on USB2 or 3 as well. I only use its Firewire socket because my MacBook Pro only has two USB ports and I need them for other things. I spool audio to an external Thunderbolt drive so am left with just one spare Thunderbolt port to which I attach the UFX. To update the firmware actually requires it to be connected to a USB port on Mac or PC.
 
If I were buying a new one now, and having tried RME I'd be reluctant to go anywhere else without a very good reason, I'd go for the Thunderbolt/USB model. USB3.1 may be the latest thing, but with anything to do with computers if you hold off because something newer or the same thing for less money is just round the corner you'd never buy anything. Eventually you just have to get on with it or quit :-)

Joining the RME praise-Choire: I have used my Fireface 400 almost everyday since 2007, it´s been out of production since at least 2013 & they released the latest drivers in December last year - so as long as the other hardware works, future compatibility is not something I´d worry much about.
The only problem I´ve had was that the PSU started making noises about 1-2 years ago, quickly & cheaply solved, I bought a new RME PSU for about 20-25$.
Other than that it has been rock steady through Windows Vista, Windows 7, Win 8/8.1 & so far Windows 10.