Exposure metering doesn't work with IR-filters, so I guessed the exposure time in manual mode. With some experience it should work fine. (Through the very good file quality some underexposure isn't a problem at all, at least when shooting in RAW mode.)
You have to use a tripod for shooting with an unmodified Olympus E-330. Due the very long exposure times getting good infrared images will be difficult. Mainly caused by subject movement due wind.
How to use it:
The E-330 (and maybe the Sony A300
and A350) have an aditional LiveView mode using a second second sensor in
the viewfinder chamber. That sensor is IR sensitive and you get a useable
LiveView picture, allthough it isn't 'high resolution'.
Further it is possible to use the autofocus, since the AF-sensor is also
In the field the long exposure times are a problem. Often you have to exposure for several seconds resulting in wind-blurred pictures. Despite beeing comfortable (for a DSLR), it's complicated compared to good IR compact cameras.
with RG715 (WB manual in RAWShooter):
comment: Colours are nice in a way, but nothing special. Noise isn't a problem at all, not that I expected some.
If you havn't a problem with that, you can get high quality pictures. Little noise and high resolution for static subjects are common.
Personally I don't consider file quality that important, therefore I prefer to use compact cameras for infrared pictures. (At least the better ones).