Looking for a better cheek-weld than my MOE stock in a SOPMOD-style package, I looked into the LMT SOPMOD, B5 Systems SOPMOD, and VLTOR IMod.
The LMT SOPMOD is too expensive for me. I'm sure it's real nice, but I don't think it's $200 nice. Put it another way, $200 is 20% of what my BCM middy cost me.
The B5 Systems SOPMOD is an economical alternative over the LMT SOPMOD and it's even more appealling that they are also a government supplier of SOPMODs. However, it seemed hit or miss w/ the fitment -- it fit perfectly for some, while it fit a bit too snug for others. It seems like B5 is listening to their customers and making adjustments and improvements over the SOPMOD design though.
Ultimately, I chose the Vltor IMod because it's the most economical alternative over both SOPMODs. Unfortunately, what concerned me about the B5 SOPMOD w/ regard to fitment is also a concern on the Vltor. It's just a wee bit too snug for my tastes and for that, I give it 4-stars.