flexer

I have three Porter Cable grip to fit (GTF) work horse drills, 5 - 10 years old, Nicad, 5 lb 10 oz. weight. I have three of this well worn but fine product because I keep different bits in each - drill, screwdriver, etc, rather than changing bits on a large, many piece project. I am aware of the Festool incompatibility with my drawer full of 1/4" hex bits and have printed articles form the knowledge base here. I have read same comment from other users. Aside from the catalog, what source of literature is available with descriptive simply-put marketing specifications/descriptions of the different models of Festool drills that I can consider. Size and WEIGHT are my concern as the same 5 - 10 years have aged me more than these tools. I really like the idea of the offset chuck for close lateral drilling, and shorter distance from the object front to back close quarters.