The Crystal I have is not completely seedless, but close to it when you compare to a regular guava.  Maybe less than 15 per fruit.  But the seeds are edible and don’t bother me.
A friend told me that his Crystal appeared to have more seeds than expected....and I do recall reading somewhere that a seedless variety can get more seeds if there is a another pollinating variety (non-seedless) nearby.

Several of my friends and I grow only Crystal seedless.  I can’t personally say if it tastes better than other seedless varieties, but two of my friends vouch that Crystal is the best.  I found that it gets sweeter as it gets softer.  But while eaten when crunchy, it is well balanced...slighty sweet with a little tartness. 

CH Fruit Tree Nursery...I believe this is the same as Tropicalbonsainursery.net.

i am in so cal would love to pick one up let me know when they are ready

I put you on the reservation list and will notify you come spring.

hit me up in the spring and hope i got a space for it! white pirie was the first real mango i got to taste that got me into the mango madness. lol. so it's got a special place for me.

Ok.  Reserved.

1. White Pirie (covers Indian - piney flavor profile)
2. Lemon Zest (covers citrus flavor profile)
3. Piña Colada (covers both the pineapple and coconut flavor profiles)

Thanks Brad!  Shipment came in today.  All sugarloaf crowns look great!

I have some kauai white sugarloaf pups for sale.  8$ each for normal size with roots, 12$ for big slips.

PM sent.

One of solutions is to use horticultural oil or neem oil (Spray on tree and foliage) during non-sunny conditions.

Simon,
Will be interested too as to how well the jumbo kesar is.  I am assuming though that it will be extremely  fibrous near the seed like regular kesar (imported from India), making it less enjoyable in eating the “meat” around the seed.  For this reason, I haven’t really focused too much on kesar or jumbo kesar,  but on other varieties like Son Pari, which I felt were on par with the flavor profile of kesar, but without the fibrous area near the seed.  Maybe a CA grown jumbo kesar won’t have that much fiber around the seed due to SoCal soil/fertilizer conditions.  Waiting to hear your friend’s report.

If you listen to Laguna Hills Nursery (videos on YouTube), you shouldn’t use any wood products (compost) in potting soil. 
I’ve just started to trial this recommendation, which is basically contrary to the entire Ag industry (potting soil companies). 
I’m using 50% peat moss and 50% pumice (alternate equivalent coarse perlite is easier to get than crushed pumice) for potting soil.  There is another potting soil mixture of 1/3 peat moss, 1/3 crushed pumice (or coarse perlite), and 1/3 sand, charcoal, and clay that results in less compaction over time.
btw... they recommend sand as the best growing media, but that weighs a ton.

Received this link from my friend JF... promising news.

https://news.ucr.edu/articles/2020/07/07/uc-riverside-discovers-first-effective-treatment-citrus-destroying-disease

You should also ask if they are certified to ship to CA.  CA has strict regulations on incoming plants.  Hate to see your plants getting confiscated entering CA.  Good luck!