Tampines RWS shuttle is always with standees. i was walking to
the MRT station as they boarded the bus. i didnt stay long enough
to see what those who couldnt board did.. take train or wait
another hour. 
train fare from tampines to HBF (if there was no earlier trip on a
bus) is $1.85 & RWS8 $2 or Sentosa Express $3. the shuttle is
definitely useful for families..
Bedok RWS shuttle adult $4. not bad!
dun forget Weekend there's 188R & 963R.
To RWS: $1.85 + 65c = $2.50. Back: $1.31 (188R/ 963R) +
$1.19 = $2.50 (Of course can take RWS8 free out pay $1.85).
Total: $5 vs $5.70 (RWS8 option).