I'm 51 and grew up on tube amps, but for just practicing even getting load, I don't hear a lot of difference. The modeling is so close and you do not have to turn it up to get the great sound from it.
The recording feature of the Jam opens may doors. Even just recording your self and listening back. You can also plug in a MP3 and jam along with it.
You can plug in second guitar/bass/piano/Mic at the same time your guitar is plugged in. So a friend can stop by with just his/her guitar plug in and you both can Jam through it.
It has a head phone out you can use with head phones or plug directly into a recording device......... I could go on.
The other amps are great also, but I don't think they will help you advance in learning nearly as fast as the Jam.
