I've bought the Hualingan unit a year and half ago and have been extremely happy with it. My X does not have dsp, so it was plug and play. I had to cut the frame where the old mid and radio were but no biggie. All is good and I've enjoyed it since then with no issues - it looks great, sounds great and had only compliments. I also considered the Dynavin unit but did not like it too much - it did not look as factory fit as the H unit, but that is my opinion. That new one on ebay looks good as well and has the faster processor and some better functions I believe.
Here are couple of pics of my unit.

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