OM-21 is a Great Deal
After playing my 1969 D-18 all of these years, in 2013 I bought an OM-21. I was use to the D-18 mahogany / sitka spruce sound but when I picked-up the OM-21 being a rosewood / sitka spruce guitar in the OM body style, it was a big WOW. While the base is a tad lighter than the D-18 dreadnought, the OM-21 had beautiful sweet and rich tone and with the redesigned neck, it is a joy to finger pick. Basically it is the same body as an OM-28, 000-28, but the OM series has the long scale neck (000 has the short scale) and it has a teardrop style pick guard whereas the 000 has the regular style. I like the base response of the OM better than the 000 series. Now for the best part - you get the same sounding guitar as the OM-28, but because the OM-21 has less fancy apportionment's, it is less money. I also found out later that the OM-21 is one of my local music store's best selling Martin. On my D-18 I switched to Martin Retro monel strings - a game changer for a mahagony guitar, but for the OM-21 I stayed with Martin SP PB Life Light strings - just so sweet and rich on the OM-21.