I've only used Fusion acrylics from Nail Harmony & once you get used to ratio's etc, it's really easy to work with.
Am sure there are other top brand products that work as well, therefore my comments are bias to what i only know.
I've just taken delivery of the Prisms colour acrylic collection & was having a play about with them before, again, only ever used these, but they're beautiful to work with.
I did the 4 day intensive course purely cause there wasn't a local 20 week course to me. Ideally i'd have preferred to do this as you can work out any issues you have as you go along, but with regards to the product, i cant fault it.