How well does XTools work in different versions of ArcView (3.0a, 3.1, 3.2)?
Xtools works greatly better in AV 3.1 than in 3.0a and it works somewhat better in AV3.2 than in AV3.1. The reason for this is that ESRI has been progressively fixing bugs in the Avenue programming language that XTools is built on. ArcView 3.0a was bad enough that I strongly recommend upgrading if you want to use XTools for any significant amount of complex overlay analysis. Here are links to two benchmark tests evaluating Xtools against ArcInfo and ArcView 3.2 against ArcView 3.1: Comparison of ArcInfo Overlay Functions to XTools Overlay Functions. Comparison of AV3.2 shape overlay requests to Av3.1 XTools versions 10/1/99 and later may not work with ArcView 3.0a.