I can relate to the wides in club nets being a left hander.
Is the bola JR quick enough? How does it compare to the main model apart from the speed.
I find Bola JR to be more than adequate. The max speed is 65 mph. I generally set it between 57.5 to 62.5 mph. If I want to practice against quick bowling, I move the machine to 18 or 17 yard distance from the popping crease. The swing control works beautifully and you can get banana shaped in and out-swing deliveries. Bola JR is easy to transport and very light to carry in/out of the car trunk or back seat. The poles are short enough to fit in a small/mid-size sedan if you roll the back seat over. I use a portable battery and a feeder extension which gives me 18 deliveries per feed. In my opinion, it is better than Bola PRO for club use. Two types of balls are available, a softer orange and slightly harder white to mimic hard/fast bounce. Again, don't be decieved by the soft ball ("JR") image, it is the best tool to improve your timing. After a few rounds, you will notice soft balls racing to long off/on boundaries because of sheer "timing". It is an amazing training tool.
I also own the regular (PRO) Bola model and it is a heavy beast to setup and transport to/from your nets. Also, the higher speeds really server no benefit when training muscle memory. Plus, Bola regular balls are hard and injuries are a real concern (I ended up in ER with a golf ball sized contusion trying to pull a 75mph ball - I pulled too fast and got hit on my right forearm).
Per my discussions with the owner of Bola, the impression (my understanding not exact statements) was that the JR machine was really developed as a portable version and not as a kids/"junior" player machine. But, they also didn't want to undercut the adult market for the regular (PRO or big) Bola machine. So, they market the lighter/portable machine as a "JR" or kids machine.
Having said all the nice things about Bola JR, one thing is that it can't throw crazy Warne/Mushy style spin balls. I just set the speed to 45-50 mph and set the swing to 3 or 4 degrees and aim the nose high. Balls get a good drift and some turn for spin. It is good enough for me.