I forget it's not the most used term. S/H is semi-hydroponics. It's a manner of growing orchids in an inert potting media, in my case, clay pellets. There is a semi-hydro forum here explaining it in better detail, and firstrays.com gives a lot of good info as well.
Roots growing out of the bottom is completely normal. A repot is only really necessary when the plant is literally bursting from the pot, or may do so when the next new growth matures. It's best to do this when new roots are starting from the newest growth, but again, it's not required.
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