In it's promotional materials, Merriam-Webster takes pride in its large scholarly editorial staff, and huge citation files. In fact, it is a company devoted to producing high quality scholarly references, and its pride is justified.
Because no dictionary can include everything, the art of producing a fine dictionary is the art of choosing wisely, what to include and what not to incorporate. Some desk dictionaries are too concerned with inflating their word stock with esoteric chemical names and proper nouns, leaving little room for the true lexical entries you are more likely to investigate. Some of these books only give a few near-synonyms to define a word. Others fill valuable space with thumb nail photos, which are fine if you want a picture book.
Merriam-Webster's 10th Collegiate chooses its word stock with care. It uses font sizes and page space judiciously and therefore offers more of the information one is likely to want. It provides carefully crafted definitions, based on citational research that reveals the subtlety of connotation as well as the more obvious denoted sense.
M-W's illustrative phrases are excellent, with many cited from literature. The word stock is extensive as well as current. The synonym studies are truly useful, revealing the fine shades of difference between the synonyms listed. The usage notes are based on citational evidence, not on the opinion of elitist "usage panels". When a word's usage is at issue, this dictionary gives you the facts, not opinion. It's dating of the first known appearance of words is perhaps not essential, but it is a welcome feature lending historical interest to the entries.
I have only one complaint about this otherwise exemplary dictionary. It's treatment of trademark entries reveals a reluctance to report the actual usage of such terms. Taking the safe approach, it reports for example that 'band-aid' is always to be capitalized, thus: 'Band-Aid', and it defines it only in its most limited sense:
"Band-Aid: trademark--used for a small adhesive strip with a gauze pad for covering minor wounds"...Trademark issues aside, this is the desk dictionary of choice. If you have never owned a Merriam-Webster Collegiate, you will be pleasantly surprised to learn how much better a desk dictionary can be. Use this reference for a year or so, and you will seldom bother with other dictionaries. If you care about the English language and value its mastery, this dictionary will inspire a passion for it.
The standard edition with its bright red dust jacket, is a handsome and rugged volume. This invaluable reference is bound in sturdy boards with a durable linen covering. The thin paper stock results in a thinner volume, yet it contains more substance than the bulky thick competing books.