After two weeks of online "due diligence" I am still confused about the pro's and con's of where to mount the hub motor. It appears to me that the only concern (except for structural considerations) is weight distribution and this does not appear to be a big issue. I am starting out with a Trek Navigator bike and am currently leaning towards the Ezee Kit and a 48v battery pack.

Need your help and valued opinions. Thanks

I have installed one front hub and have another waiting to be installed.

Front Hub motors are probably easier to install as most kits have the motor premounted in a wheel. Arguments generally concern the weight on the front wheel and lack of mount for a disc brake.This may have changed but front hub motors were not recommended for use with front shock absorbers.

The eZee is a good choice being a much lighter motor than most others and has a disc brake.

The motor width can be a factor in front hubs however, the eZee is relatively narrow.

I have no experience with rear hub motors. It is generally accepted that a more powerful motor can be used due to heavier drop outs but they can be tricky for a casual user to install. Weight distribution can be a factor especially with the rider and heavy SLA batteries and a motor on the rear.

Heres a thread on the same subject
http://endless-sphere.com/forums/viewtopic.php?f=3&t=3015&p=43056&hilit=+front+rear+motor+#p43056

I would steer you towards a rear hub motor with a full suspension bike. You are putting on a lot of weight on a bike and the handling tends to be "rough". Full suspension will cushion you improve jarring you feel in your hands and your seat. Front hubs on a rigid front fork are easy to install, but on long rides you will sometimes feel like you've been handling a jackhammer.