Positives:
The interface is really good,
1. It works well in terms of note recognition (I use the rocksmith cable into an iPad pro)
2. Wide variety of generes catered for (see notes on song selection below)
3. Lessons seems good
Negatives:
1. The song selection is not a good as Rocksmith14 (live versions etc)
2. You should be able to favourite songs in categories etc
3. Too small to use mobile version on a phone/small iPad
Ultimately it comes down to 2 things
1. Are you happy enough with the song selection (there are some nuggets in there amongst the dross) to pay a subscription
2. Can you live without all the DLC (official or other) that you might have had as a Rocksmith2014 user
I have subscribed and am enjoying using Rcksmith again