The Vitamix A2500 from the Ascent Series combines Program Settings with a Variable Speed control dial. Select a Program and walk away; the A2500 will automatically adjust blending times and speeds suited to the size of the container in use. You can still create your own recipe by selecting various times and speeds to achieve perfect texture, whether it's a chunky dip or a smooth pureed sauce. Self-Detect containers allow you to build a customized blending system that fits your needs (available in 20 ounce and 8 ounce sizes.) Containers from the G-series, C-series and S-series are not compatible with the Ascent Series machines.