Amalgame

Best multi effect for the price/features ratio. I originally bought it as something to use on a touch screen, as it seemed fairly live friendly. While it's not ideal, it does work better than 90% of plugins. It has a demo, so I'd recommend you try it before you buy if that's your intended usage.

However, upon more usage I've found this to be a great sound mangler/transformer. You want to really transform that pad/drone/whatever into something completely different? Here you are. The plugin has 23 effects and a "thru" that you can insert in the chain. Each effect has an XY pad (that an be automated), and separate sequencer for both X and Y axis (which combine with the automation semi-gracefully). The sequencer is from 1 up to 16 steps with variable speed. So polyrythmic modulations are not only possible but really easy.

As is obvious, with 23 effects there's more than one effect that is not especially shiny (depending on taste, of course). But conversely they're all good quality and can fit almost any need.

All in all, I would rate this plugin firmly as "very useful". I don't personally find it very exciting, but considering that I use it almost everywhere I find it hard to criticize this plugin in any meaningful way.