Hi,

I have two LFR1100s (as front L/R) in my 5.1 HT system and they work great! There are two potential downsides:
1) They ideally need more room behind them compared to M100, and
2) They cost a lot more (including DSP and more channels of amplification that are needed)

I also use mine for music so consider it well worth it but that might not be the case for you especially if you plan to use a receiver in your system.