Rational "Gotcha's" + CASE stmt question

[larry@VLSI.JPL.NASA.GOV]

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We have just about decided to buy one of the smaller Rational 
systems and try it out on two real 3-5 person jobs to evaluate 
Ada as a mature technology.  We'd want to get software--such as 
their CMVC (Config Mgt & Version Ctl) option--to cover the entire 
life cycle, not just hardware and compiler.

What sort of things should we look out for in making the purchase 
that the sales people aren't likely to tell us (for malicious or 
innocent reasons)?  This includes "gotcha's", third-party SW or 
HW, products or site- or training-preparations the sales people 
might not know about, etc.
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In several pieces of Ada SW recently I've seen CASE statements 
with dozens (in one case more than 200) alternatives.  The longer 
ones often implement subprogram-dispatch tables.  I know some 
compilers for other languages translate such statements into a 
hashed-jump routine.  Is this often done by Ada compilers, or 
should programmers consider writing their own?
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Thanks in advance.
                                           Larry @ jpl-vlsi