The 0.9 issues mentioned are those found in many beta projects: little or no documentation, potential crashes or data loss, unusable or poorly working features (bugs).
I have been using the Microsoft Spyware program since the articel came out and have been very happy with it. I use it along with SpySweeper. They usually find the same problems but one will also find problems the other missed. I have seen some of the 'beta-ness' of the Microsoft program show through, including occasional crashes. So far, however, it works very well for a 0.9 version program from Microsoft.