I can answer all of your questions with regards to the Mediastation. Although mine arrived with loads of faults and I've since received a refund for it, I had it over a month so can easily give you some insight.
GM sounds - all of a very poor standard, the likes of Casio and lower end PSR instruments sound far better.
Lionstracs sounds - a few good ones but certainly no way near the likes of Korg, Roland, Ketron, Yamaha, Technics, Wersi etc
Styles - Absolutely terrible. Poor quality midi backing with weak intro's and endings that do not work. Very little fill ins or variations on offer. Later updated to some new EMC styles, still very poor, sounds like an ice cream van and not joking here either.
Audio midi arranger - The audio styles as far as I am aware are in production. They were not present on my Mediastation. No demos on their web site yet either. I have heard 2 of the demo styles for these and they are far better than the current ones on offer but they still have a long way to go to get near Tyros 2 territory (sorry but I haven't heard many G70 or Korg PA styles)
VST plugins - I could never get any to work although the NI organ plugin was good. My full version of Albino 2 never worked even though the demo version did.
Giga sounds - Having a 1gb piano sound did nothing for me, I've heard far better from arranger keyboards (eg. SD1, G70, G1000). Other sounds were reasonable but nothing amazing.
Keyyboard features: Very nice keys (feels like a FATAR master keyboard) but there is no aftertouch on them - this is ridiculous for such an expensive keyboard and is a must for me when purchasing an arranger.
Fairly easy to navigate around the various options and buttons but without an instruction book it gets hard to work out which to press at times. I think the instructions are just in Italian but there is a limited online help feature and also a help button on the MS itself.
To sum it up, the Mediastation I had came with loads of faults. These ranged from sounds cutting out or sticking, MP3 files pausing then speeding up in order to catch up to where they should be, terrible noises coming from some VST plugins (full versions not demo's), only main XLR outputs were set up, this I find very poor since many users would want to use the stereo outs instead which you have to set up in something called JACK. JACK never memorised setups when keyboard switched off so this process was lengthy. Most times I booted up there was no sound at all and it could take 6 reboots totalling almost 15 minutes until sound was audible - very poor. USB doesn't work for a mouse or keyboard have to use the PS2 mouse.
Couldn't use the update from net feature button as the server was always down or hacked into. I even had to reformat the entire hard drive after 4 days because Domenico thinks I messed it up. I never even touched the thing or edited 1 single sound as the MS always died on me. Even pressing the edit button and moving the resonance slider caused the MS to hang up most times resulting in another reset.
I know Fillipe said he didn't have these problems so I guess I was very unlucky to receive this instrument in such a bad state.
I honestly think the Mediastation has too many software faults and these should be ironed out before selling them. I didn't appreciate being a guinea pig for Lionstracs after spending just over £2600 on the top model - ouch
I would say the Mediastation does have some good sounds (synth type, karma/wavestation sort of stuff), for GM/midi files/arranger use just forget it. This is definitely not an arranger keyboard. I doubt even with the new audio styles if and when they appear it would come anywhere close to the likes of a Tyros 2 or G70 since the other sounds are extremely poor quality.
I'm not having a go at Lionstracs as Domenico is a great bloke and did try to help me. I have spent the last month living on Yahoo with him trying all sorts of updates etc to stop these faults but they all failed. He did also refund me so good on him as I guess some companies could have said TOUGH you bought it so live with it.
Make sure you try the MS in person and don't buy it immediately like I did.
The MS has great potential if they can put some good styles onto it. The sounds need a major revamp, GM wants updating maybe to a large giga type library which is possible with the MS, instruction book is a must, get aftertouch on the keys asap and get rid of all of the faults.... Maybe next year the MS will kick some serious butt in the keyboard world but for now it's seriously lagging behind.
Please note these are my findings from my experiences I had with the MS, the users who have purchased one of these that works should be able to offer a different view.
If YOU have a Mediastation get replying on here now..
[This message has been edited by Craig_UK (edited 11-01-2005).]