I agree with getting the regular-sized bottle both if you have fragrance sensitivity and to make sure it'll work for your hair type. I have both frangrance allergies that can lead to asthma attacks and also have very picky hair. I picked up honey lilac oil, mousse, and styling cream and while I like them, I add oil to my hair when putting in everything and sometimes if I put too much, I'm sensitive to it. I seem to be okay as long as my allergies aren't already acting up. There are a few that I can't use, and I'm not sure what to do with them as I opened them to smell them and won't be able to use them (Winter Cranberry set off an asthma attack just from smelling it, and Fall Apple was a no-go as well and they're both 32 oz!).
About 5-6 years ago I became so excited about the gallons and had already ordered Fig, the main one I use out of the original line. I have coarse, wavy/curly colored hair that needs a lot of moisture. My main CCs are Fig, TT, and 613/619. I've tried most the seasonals, and Honey Peach is the only one I can use without having to add a lot of other CC to. TT was already sold out or else I'd have gone with it, so I ordered Lavender as it sounded like it'd work for me, but nope! I love the scent too! Once the second cleanse was started, I used it mixed with TT for the first clease, which I've been doing with my seasonals that I'm unable to use alone to get through them. BTW, after seeing that gross gallon bottle with mold, I checked mine and both don't have any problems, and both are still in my shower though the Fig is empty aside of the bottom of it, and it's been a good 5 years.
Since Honey Peach is the only seasonal that I can use mostly by itself for my hair type and I do like the scent, last year I picked up a set of the mousse and styling cream. I love the scent in my hair though it's definitely not overpowering. I saved so I could get styling products this year (I have a few 32 oz bottles of the CC in Honey Peach from last year) and have had horrible luck so far! I'm on waitlist for the first ODO of the oil, styling cream, and I think the 16 oz cleanser. I DID order the singular oil after others had their waitlist go through and mine hasn't despite ordering the same day it was presented. The 32 oz with mousse (I really want the mousse!) and brush isn't worth it when I only want the mousse, so I'm hoping for another configuration with the mousse. When that was a bust, I checked out the replenishing mist duo and that was already on waitlist. After still being on waitlist and only having an oil go through, I decided to go for the texturizing spray and wanted it in Bamboo (never tried either as it sounds like they wouldn't work for my hair type as far as the CCs), but it was out so I'll get to try the other Fig. Perhaps it'll smell good with regular Fig??? Some of the scent mixes are pretty stinky! It sounds perfect for my hair type, as keeping frizz away is a constant battle and right now, unless I air dry my hair, it tends to frizz. I'm still hopeful for more Honey Peach products- I guess if my bad luck keeps up, I can always keep my 619 TSV going and add the HP oil to those products! Something about the scent cheers me up. The CC doesn't moisturize too much but still gives my hair the moisture it needs without weighing it down if that makes sense. Sorry for the ramble, I wanted to help others as well as share my experiences. I add about a dropperful of oil throughout the ends of my hair after showering to help smooth it out so that tends to condition it as well (my hair is long).