Where to buy:
* http://www.elses.de
* http://www.chiptech.de

Official NitroXX support website:
* http://www.gamesx.de

What was in the NitroXX package:
* the NitroXX modchip
* the wire adaptor
* the LTP cable

What's in de IRmod package
* the IR-mod
* all wires
* all 'clips' (nosolder version)
* 'IR eye'

What you need to install it:
* a v1.0/v1.1/v1.2 xbox
* a TORX 10
* a TORX 20
* Solder Equipment
* a bios - NitroXX is sold empty.

Downloads:
* NitroXX manual (german): here
* IR-mod manual (german): here
* PC-BioXX/PC-NitroXX v1.4: here

NitroXX:
First you need to install it , before you can flash it (needs power).
Installation of the modchip is like expected - it's a typical LPC wire-install (LPC points are very easy - the d0 is medium) with a few more wires if you want to use the reset/power button for the modchip en/disable. There are very good instruction manuals - sadly these manuals are only available in german atm. The tutorial also explains how you can install a status LED on the NitroXX.
The NitroXX was tested successfully - flashing (via PC with PC-BioXX v1.4 program) worked without any problems. Bios switching and en/disable worked. The biggest downside is that you can't flash the NitroXX with xbox software (like via EvolutionX).

POSITIVE:
+ New version of the legendary OpenXbox/PC-BioXX
+ 1x 1024 , 2x 512k , 4x 256k bios switching
+ Disable mod option with power/reset-button for xlive (no extra switch)
+ Flasher included - no risks of bad flashes
+ PC-NitroXX flasher (win32 program to flash your modchip) works like a charm
+ Distributed without bios - fully legal
+ 1024k max size ... good for possible larger bios releases
+ Easy solder install

NEGATIVE:
- Not flashable via xbox software
- Price
- All documents are in german (english version should come soon)

IR-Mod:
There are 2 version of the IR-mod. One that needs soldering , the other not. Installation is not straightforward so you'll need the installation guides. They are again only in german so far , but the pictures really tell enough , so you shouldn't have any real problem to install it. You will also need a remote - I tested it with the official Xbox remote and it worked fine. I'm not sure if it can also work with other remotes. The installation requires to take power directly from the power cables (the no-solder IRmod 'pinches' the cables) which is kinda strange , but it works fine.
The IRmods allows to power of/off your xbox , eject , en/disable the modchip and change bios with the remote. If your games are on the hard drive you really don't have to come near your xbox anymore - that's really great :-)
This modchip has been tested with the NitroXX , but all functions except the bios selection will of course also work with other modchips.

POSITIVE:
+ IR-mod addon is original and adds a cool new feature to the xbox
+ No need to touch your xbox anymore ... you can operate everything with the remote
+ Price (you need the Xbox remote though)

NEGATIVE:
- All documents are in german (english version should come soon)
- Installation is not so obvious , but the nosolder version should be easy enough for most people.