I'll get back to you in the next day or two. Keep an eye on this thread because I'm just going to edit this post. I've started answering your question a few times, but it keeps sounding like I'm bashing the mimic, which I'm not, the mimic is great
Edit: Here we go. Let me know if you have any more questions.
The mimic is the best sounding module on the market for sure. There is a noticeable difference between the Mimic and the Strike. For me, its the ease of use and flexibility of the strike that brought me back.
The Mimic is basically designed for sound engineers. It's a full on audio console with loads of options to do whatever you want with your sound (multiple mics per instrument, multiple ways to adjust your sound, etc). You have to have a pretty strong background to use the Mimic properly. You can also get lost in the menus tweaking stuff pretty easily.
The Strike sounds are great and are easy to work with - you don't have to worry about adjusting direct mic, room mic, overhead mic, top/bottom mic, then adjust the EQ, attack, sustain, and release for each mic for each instrument you want to edit. There are a few parameters on the Strike to mess with and for me, thats plenty.
The Strike is also a lot more flexible of a platform. Pearl/Slate have talked about releasing an editor ever since it was released, but that is still in the works (who knows if its even in the plans). The Strike has a great editor on the computer where you can import multi layer samples and have total control over how the instrument works. For me this is huge because I like importing stuff. The mimic is limited to one shot samples at the moment and while thats great for a sound effect or something, it is not so great for drums (although if you know what you're doing, you could get almost any drum sound you want out of the Mimic.
Further and something that is really big for me is that you can have 2 sound layers on every zone on the strike. The Mimic only lets you layer the snare and bass.
I feel like with the Strike you are getting 90% of the sound quality of the mimic, but its so much easier to use.
Lastly, the Mimic is way more expensive.
All of this said, I'm in the minority here. I only know of one other person that went back to the strike after having a Mimic (Siren Drums on youtube). The Strike definitely has its warts (200mb per kit comes to mind, although thats more of a soft cap - the stock hihats are also not so great), but once you learn to work with what the Strike is awesome!
Just be ready, because there is a fair chance you'll need to RMA something when your Strike shows up. Call Alesis if this happens, don't email. They are VERY fast to send replacement anything if you talk to them on the phone.