Martin Combo Pack (MSP-4100, MSP-PLUS-4100, MFX-740) with Sticker, MSPPACK0002star rating 4JohnDecember 7, 2009I have been using the MSP-4100 on one of guitars and I really like the sound. I would have given it 5 stars, but I have not tried the others yet. Juststrings prices are excellent.