While i can't speak as to the validity of such claims, the acid i bought supposedly @ 200mcg was fairly intense for a first time dose. In retrospect half would have been a nice place to see what all the hubub about cid is all about. I'm pretty small though, and diddn't have much of a psych tolerance at the time, but have a good # of trips on all kinds of psychs under my belt, and know the waters in terms of going deep, at least with acetylpsilocin, pharmahuasca, 25i, and 2c-d. Still the whole trip kind of caught me off gaurd, acids fairly unique though so thats to be expected.
It wasn't too much, and i've had my fair share of trips on other substances that took me deeper, but going for a bicycle ride was prob a bad idea that day. Granted it wasn't around cars or on pavement, so there wasn't a risk of getting my ass ran over, but definately a stay at home or know the waters level of intenstiy at (supposedly) 200mcg.
If you have a few, or have acess to more, i would just take half. Starting slow never hurt anybody, and i wish i did that my first time. Its kind of hard to do so if you only have one dose, and no way to get another tab though.
If you do decide to dose the whole tab, i'd take the above advice as far as set/setting with great relevance. A whole tab of (supposedly) 200mcg can be a fantastic trip if your prepared. If your prone to rough trips, anxiety or uncomfortabeness while tripping on ocassion, i would take half. No point having your first encounter with lsd being uncomfortable, underwhelmed is a far better alternative. Especially if you have a few and can dose higher next time assuming it wasn't enough.