Hi, just completed the game, and before I start adventure mode plus it says it will overwrite my saves, but keeps my chars.

I just want to make sure, if I do start adventure mode +, do I keep MY ranger and MY tank, as in, I can play either of them over xbox live with a buddy, and I still have their gear and talent trees and spells, respectively.

Again, just want to make sure.

I'm playing retail PC, but did finish my first game today, and did start adventure mode+

By pressing/activating adventure mode+, pre-order content is now available in Crucible, and whatever gold tier I have unlocks a certain amount of Crucible content.

I played around with Crucible to verify this, and then started a new slot 1.1 adventure, as the old saves had indeed been erased.
The only things that were forwarded after starting the +mode were the crystal weapons for both characters. All other gear was starting gear as with the start of my first play-through;
talent trees, spells were at infancy again. Gold and whatever spare, unused crystals I had before were saved and forwarded. I assume from the porting that the xbox will do the same.

Old school mode was unlocked, and I was able to tweak and add bonuses to the characters via the game menu when playing in old school mode.
Also, since the game uses the Unreal engine and I've completed my first game, I will likely start simple edits of the .ini files to add/adjust content since I have the retail PC version.

Yea when you start Adventure+ Everything will be wiped out excluding gold you earned, unused crystals, and the crystal weapon if you got it. The crystal weapon will be downgraded though, for the bow drops from 150 to 30 damage.
I was playing with a buddy from 1.1 to like 5.4 and finished the game myself and did this and couldnt play with him due to losing gear/extra health and damage from killing x amount. Also the perks do not work when playing with him, but that may be because he is not on adventure+

Also to the above poster, you could use your pre order items on regular adventure, just had to enable them in the perks section.

So say I go to slot 2 and start adventure plus, do I still keep the characters I had in slot 1?

You basically start fresh, other than what i mentioned. When playing new adventure including live co-op you'll be on first chapter like you just started.

@Marchwaltz ... you cant start a "new game+" on the second slot, because only your slot you've been played through with will have the option to start a new game +

I started Adventure + on the pc but I don't have regenerating health or mana and I don't have unlimited arrows... do I get it later or maybe I did something wrong

Ok here goes some stuff.

If you start Adventure+ on the same slot that tou completed the game the first time around, You will retain ALL of your gear gear from the first playthrough. At least that is how it worked out for me. However, the crystal Chests and shard fragments collected from the first playthrough will be empty because you already collected them. the Upside is that the 2nd playthrough on this slot will be easier because you retained all of your end game gear with the high damage dealing. This will also allow you to grab the secrets that you missed from the first playthrough. I missed quite a few of them because I basically just wanted to finish the 1st playthrough quickly. Additional playthrough's allow me to take my time and go at a slower pace because I was able to keep the high Damage weapons from the first playthrough. In Fact I didn't evejn know I had another slot available until i read some stuff on these forums.