I have added a newly converted E-PL1 Visible Spectrum camera to the arsenal! Coupled with filters from B+W (092 = 695nm, 093 = 830nm & 099 = 520nm) this promises to be a great system. When you also consider that by placing an IR/UV blocking filter the camera will continue to shoot standard color you will have a great compromise camera system! It also has the VF-2 Electronic Viewfinder which makes it much easier to use than the E-P1 in 720nm! There are a great assortment of lenses for this system and I am currently using the Olympus 9-18mm & the Panasonic 45-200mm and the Olympus kit lens, 14-42mm. These are very small light weight lenses that give very good results for IR. There are no hotspots and there are filters available for the 52mm and 40.5mm ring sizes.
Below is an example from the camera using a B+W 099 520nm super color filter:
The 099 filter gives very pleasing results in Faux color as well as B&W. With the addition of a IR/UV blocking filter and auto white balance the camera functions as a normal color camera!