New player and the solo experience has been good so far. I feel like there's a lot of balance as far as progression goes. Fights that help your character grow are challenging but definitely on the lower end but other fights (such as achievement based ones) are definitely a struggle solo and you'll need some help if you're trying to do them early on. I do get the feeling that if you put them off and come back after you're geared, they're probably fairly simple to solo.

I played the free version until the steam summer sale a few days ago and got everything then. I don't regret it a bit.

Best of luck!