Any of the Juki industrials are the cream of the crop...they are the smoothest and quietest of the industrials...
Some of the drawbacks are...you can onlly do 1 thing with an industrial...if it is set up to do st. st. on light duty fabrics, the feed dogs are fine teeth-feed dogs. They can be switched out to be used with heavy things, too...but you will have to purchase new feed dogs and needle plate. I think the cost for the switch is around $40...and it is only a couple of screws.
Industrials machines take a good amount of space...not portable at all. Plus you may have a problem with vibration in the floor, due to the heavy duty motor.
They take a special needle...can't just go to Walmart to get more needles.
Pretty easy to thread...most come pre-threaded...I would recommend the pull thru method, until familiar with machine. Make sure the pressure foot is up and knot the new thead close to the spool...pull thru to the needle, cut and thread the needle. Never try to pull knot thru the needle.
Hope this info will help you make your decision....