(Sent to a person who complained about Lojban...) I'm the "proprietor" of the language -gua!spi, which is fairly closely related to Lojban, and I am working in the Voksigid design team, this being a language artifact with neo-latin-oid vocabulary and radical emphasis on cases, in contrast to Lojban's denial of their existence. I am particularly interested to know what the convulsions were that gave you so much trouble, so that I can take mitigating steps in the design of these other languages. I don't want to bias your answer to fit my preconceptions, but I'll offer my representations of what people might complain about in a language; you can pick one or more, or make your own. Note that this is a "generic language complaint form" and I would hope that quite a number of these complaints don't apply to Lojban (or Voksigid or -gua!spi or...) 1. It's just too hard for me to pronounce. 2. It's harder than in other languages to learn the vocabulary; the words sound alien; I have trouble to remember them; I'm always grepping in the dictionary to locate words. 3. In other languages I have a natural feel for which words go together into phrases, whereas the phrase grouping signs in this language have to be translated intellectually, which gets in the way of comprehension. 3a. You misplace or forget one structure word and your phrase splatters from end to end of the sentence. The grammar is too touchy, nitpicky or ungraceful in error recovery. 4. I think of a familiar meaning and I can't find a word to represent it; the words which are there have meanings that aren't helping me. 5. In English and other languages there is a facility to stick basic words together to get more precise or unique meanings. I was not able to locate the corresponding facility in this language, or was not able to make it operate properly. 6. My name, home town, favorite ethnic food, pet's species, etc. are mangled in this language. The machinery for importing foreign words was hard to use or ineffective. 7. Clauses, subsentences, infinitives and suchlike are poorly coordinated with the main sentence. I have to repeat a lot of main sentence phrases in order to be sure who's doing what to whom in the subsentences, unlike natural languages where these are usually handled automatically. 8. The relations (predicates, verbs) in this language connect bizarre arguments (nouns, cases). For example I'm used to "actor causes event" but you give me "event causes event", or "actor wants object" but you have "actor wants event". It's very hard for me to change my world view to match what this language is dishing out.