I have 2 lvl 110 boosts but Idk how to spend them. I have every class on alliance lvl 100+, and also few Horde characters.
Any ideas how to spend tham, I know there are probably no great uses for me as I have a lot of characters but maybe there is still something I can do.
dunno, maybe blizzard introduces a new class after shadowlands and its worth keeping them?
There is no point in spending anything just for the sake of spending it.
Even if you feel you must for some strange psychological reason I don’t have the training to understand, at least keep one in case a Class Trial will come in handy at some point in the future.
I agree. When you boost a class you don’t intend to play it almost always ends up deleted or forgotten anyway and the boost will be wasted.
I would keep it for later, you never know.
Well yeah, that is true, but now I have 2 boosts and I might buy the most expensive Shadowlands edition and I believe that would give me another boost 
If new class comes out There is no way I am boosting it as Id prefer to experience lvling it
I might boost Dk on my Horde realm as I dont have any lvl 120 Horde characters, and I dont really want to level any of the ones I have that are kinda high level
Dont, keep them for shadowlands !
You will know what is worthy to play then for your taste and only
What about the satisfaction of spending it though?
if you already have all classes maxed out, you have your answer already,
I boosted a hunter horde side in order to unlock allied races XD
You could use it for a gold farming character. Park it outside skyreach and do the dungeon 10 times in about 30 minutes for a rough 4000 gold. You don’t need to play with it normally. You can choose the fastest class. Then whenever you want to get some could you can login with that char and do a couple of gold farming runs
Maybe now is the right time to use your 110 boosts 
With this 100% XP, you just have to do a few RBGs or Dungeons and you`ll hit 120 in a day or two.
Dont wait for SL.
PS: 2 extra 110-120s for Hallow`s End mount farm in a few months (October). I dont think SL will hit before this event.
If you are not absolutely sure you want to play something, don’t use the boost. Don’t be like me, “hurr durr I want a warrior they look fun”, deleted the next day. Since then, if I find a remote aspect of fun in some class, I trial it and level it afterwards.
I used my 120 boost to create a new horde main to do the zandalar campaign.
I still have a boost as well which I feel I can’t use as I’m levelling a couple of allied races for the heritage armour.
You could boost a worgen, gnome or dwarf if you don’t already have one to get their heritage armour. But this is quite a small reward to use such a thing on.
Well yeah I can get heritage armor, but boosting a hero just to get it doesnt sound so usefull to me as you can only use heritage armour on that specific race…
I boosted just one hero in WoD and now I dont even play him… but well its hard to play all you character when you have like 25 of them
Think of Utility.
They can be another character for farming for that mount or transmog you’re after. Or they can have a profession you’re still lacking on, going after those profession related achievements and what have you, etc.
Use them on a new server ?
In the current alpha 1-50 can be done in less than 10h but blizz announced it was currently too short and promised it would still be faster than the current +100% xp buff.
So the value of a boost seriously dropped outside of not starting from scratch on another server imo
I always think I will enjoy a boost. I never do. It goes like this:
Boost a second and a third demon hunter, have 3 of them on one server, show dominance to Blizzard!
Wait can you actually do that? xD