I had my 30D converted to IR by David at
http://khromagery.com.au/index.html
With a R72 over the lens, I got 'normal' shutter speeds for IR - eg in the sun with the camera at 100 ASA, shutter speeds of 1/500 and f5.6 and that type of thing. With a B+W 486 or 489 filter over the front of the lens and a white balance done, the camera took 'normal' photographs.
Obviously, an insert filter is much cheaper and easier than an over-the-lens filter, but then you can't use (with Canon cameras) the EFS lenses.
Have a look at some tests I did:
http://www.iceinspace.com.au/forum/s...ad.php?t=15205