There aren't many competitors for TLM missals that pre-date the 1962 ordo and calendar. My community uses the pre-1955 calendar, and there are enough differences between that and the 1962 calendar that they add up to a constant stream of annoyances if you don't have the right missal. Up until I bought the St. Andrew Missal I alternated between using the '62 Baronius Press missal and a very beat up British missal from the 1930s I had found in a used bookstore. Thankfully, the St. Andrew Missal is a solid replacement that has made following the liturgical year much easier.
While I have yet to use the StAM to its fullest potential, even a few weeks have borne fruit. The calendar feature at the start is a good overview of the pre-1955 structure. The morning and evening prayers are substantial. The long explanations and meditations at the start of every Sunday Mass are good for getting in the right headspace. The chant settings are in modern musical notation rather than Gregorian chant notation, which might not be to everyone's preference, but this is probably immediately useful for most people. The only downside I've found so far is that the table of contents is hidden (as it is in many old missals) toward the back of the book, before the section on local feasts.
The binding is hardcover, which I find less attractive than leatherbound, and some of the binding at the corners seems rather weak and subject to damage. Otherwise the physical build of the StAM is great. The ribbons are chunky. The gilded edge (one of two options) is attractive and forces you to pull apart the pages in a satisfying way. The missal has a good weight to it without being too heavy.
Highly recommended for anyone in a pre-1955 TLM community, or even for anyone whose '62 community might be trying out the pre-1955 Holy Week. I would love to see new pre-1955 missals in print, much like the way we have a wide variety of 1962 missals, but until then I'm glad to see that the StAM is a solid option for those who need it.