first off, no, test boosters are not the closest things to steroids.
secondly, there are a few things to look at when considering test boosters natural or hormonal:
Company
Protodioscin Content (%)
Source
CofA (ties in with "company")
Products i suggest from experience/success are:
ThermoLife Tribosten(500-1Kmg/day)
DS Activate
ATD/DS Rebound XT (hormonal)
I define success as: strength gains/libido increase/positive aggression
Products i suggest from reading overwhelmingly positive reviews:
Diesel Test 2010
DS Rebound Reloaded(the new version of Rebound XT)
There are certain companies i would specifically advise NOT to purchase from, but i'll let you decide for yourself. Here is a good read along with the testing of Tribosten:
http://216.119.83.73/prod_images/tribosten_lab.pdf