Welcome EvilMonkey! I'm relatively new to the E-drum world, after playing acoustics for several decades (poorly at times, but I'm getting better). I did tons of research before deciding on something that had the features at a price point I could manage. This was truly a challenge, especially when comparing all the Alesis models. Yamaha and Roland were easier, as they really have clear dividing lines between easy-to-use, less expensive models (rubber pads, bare bones module) and their "pro" versions. But to get the features I wanted, I started to lean towards Alesis. Read enough reviews and you'll find that the build quality can be an issue that doesn't seem to plague the higher end of the e-drum range.
I did end up with a MK II Pro, as I wanted the extra tom and cymbal. I admit I was also nudged ever-so-slightly by the "Pro" moniker, which is never a good idea. I've come to understand that "Pro" in Alesis parlance probably means Prototype. The Crimson is, well, crimson red. At least that name fits! That said, I still love my kit, and I'm glad I chose it over the Crimson. I've had it for a few months now, and my issues with the unit are well documented in other threads. However, long story short: the mesh head triggers can be faulty. The point of failure is the wiring between the velocity control knob (mounted on the side of the shell) and the center piezo trigger. Without getting too technical, it's an easy fix, but annoying if you've bought a new product that is supposed to me manufactured to be hit with sticks. I am going to assume you have some small electronics experience since you're a guitarist (rewiring pick ups, etc), but if you don't have any, it's still pretty easy to learn to do.
I am documenting my pad/trigger renovation exploits for those just getting into the game, though many others here on the message board have much more experience with these issues. I'm just coming at it from the standpoint of a new Alesis user who is also new to electronic drums. As a new e-drum player, I can forgive certain faults and quirks that come with the learning curve from a former acoustic drummer. Lots of that stuff is my fault, and I plan on learning as much as possible about the internal workings of the kit so I can get the best sound and experience possible. That said, there's no excuse for poorly made equipment. I've already returned one full kit, and received a replacement that also began to fail in the exact same way. I've now learned where these critical failure points are and I'm fixing them as they fail. Sure I could have returned this one too and looked elsewhere for higher build quality. But that comes at a price that was too high for me, and I really do appreciate MOST of what this kit can do. So, after much cost/benefit analysis, I decided to keep it and fix those things I can fix, and move forward with a customized set that fits my needs.
I played the Crimson at a local music store (Guitar Center), and I was pleasantly surprised. But it lacked some features and the extra pads. I went with the DM10 MKII Pro mainly due to this factor, as well as my desire to use a VST through the computer for a better sound set. The on-board kits on the MKII are fun and great for beginning drummers, so either one will fit your needs I'm sure. But be aware of the mechanical elements that will likely become an issue at some point. I can imagine it would be frustrating if you're learning how to play the drums, while simultaneously dealing with equipment issues. Just know that the fixes are relatively easy. You'll learn some new skills and be a more well rounded technician with regards to the e-drumming world.
Just my .02ยข on the subject. Feel free to ask me any questions since I'm still wading through what this kit is capable of, and where it falls short.
Cheers,
VX
p.s. One thing to consider is getting a used or remaindered DM10x kit. It seems a lot of folks here have them, and the MK II Pro/Studio group is quite small. It sounds like the original DM10 module is quite a bit better than the "newer" Alesis offerings, as the MKII Pro module isn't a Strike, nor is it on the lower end of the scale. It's in a "middle management" zone that is confusing. But as a complete package, it's a good value. The DM10 of old has a lot of features that I'd like to have, but when I was in buying mode it wasn't available and I didn't feel confident enough to get a used set. Hindsight: I might have opted for a used/remaindered DM10 if I knew I'd be tinkering with repairs in any case. Just a thought.