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Ken both the Commercial Series and the Gen 3 Pro use the same vise and similar mechanics for the angle adjustments.  About the only differences between the two models are:

• the Commercial Series has the full blue heavier aluminum top deck and enclosed cabinet.  The Gen 3 Pro has a partial blue half round top deck plate, and the stone cabinet shelves are open.
• the Commercial Series has a slightly wider-angle range, (14º – 30º) whereas the Gen 3 Pro’s range is just (14º – 27º).   The difference is negligible and I’ve never sharpened a knife with wider than 25 dps bevels, yet.
• the Commercial is $1000 more expensive than the Gen 3 Pro.

Every W.E. model I ever purchased I am still using or I sold to someone else who is still using it. I’ve had up to 6 different models in the past 7 or 8 years.  None have broken or worn out with minimum maintenance.  I do not sharpen knives commercially although I have a nice sized collection and variety of knives I keep up with.

I really don’t think the extra $1000 investment for the commercial series is necessary.  The Gen 3 Pro will stand up to the use, just the same.  The designs, engineering and machining are just the same.  The extra money is better spent on additional sharpening mediums and accessories.

The only thing I can think of is the enclosed top deck and enclosed cabinet may be for OSHA requirements in a commercial business application like a meat market or restaurant for sanitary, safety and health reasons.