I got this mainly for Amplitude and Tonex, because I figured that at the current discounted price (200€ when I bought), I'd just get the whole package with everything. First disappointment was that two weeks later, IK Multimedia dropped the price to 150€. Big bummer right away.
I found I can get nice guitar sounds out of Amplitude, but I find myself tweaking a lot. Easy to get lost in the choice of amps, pedals, effects, and forget to make music. Still, I enjoyed exploring the various combinations. But when it comes to making music I end up more often using a plugin from the finnish neuronal guys, that has much fewer amps and actually costs more than Amplitude but I find it more musical.
Tonex is similar, even more reduced to tone models. It has some really nice guitar tones, but one needs to choose between hundreds of presets. I don't really see the point of that.
I also played with ARC 3.5 to improve my monitoring setup. That worked surprisingly well, but to use it properly one needs to buy either the IK Multimedia ARC mic or another one that comes with a calibration profile. Prepare to shell out 75€. I ended up with another plugin that I got second hand which came with a calibrated mic.
MODO Bass is nice and lets you trigger different playing styles (fingered, plek'd, slapped notes etc) using keys on the controller keyboard which are outside a bass's range. Clever!
Modo Drums sounds quite good IMHO. But the MIDI loops that come with it are rather lukewarm.
The other plugins are nice but honestly I think they are all quite overloaded with stuff. No idea why I would need five different VSTs for analog tape machines. Neither can I make much use of dozens of sampled vintage synths, without being able to tweak the parameters.
Still, I had a lot of fun playing around with everything. It's a nice package to try out many different plugins, from guitar amps over bass and drums to mastering tools. I have now a much better idea what kind of plugins I actually need, and what to look for. Was this worth 200€ — not so sure.
