I was lucky enough to pick up a Ace at PlanetVape in Canada for $110 Canadian$ which is about $83 US$, it lists for $160 C$ or $120 US$. I've had a few Starrys so familiar with the design. I'm quite impressed with the Ace upgrades and the ejector I thought was a gimmick. I like using a modded Starry for hash because of the high temps going to to 464F.
So far I've been using the rubber adapter from the Starry WPA kit with Dynavap nipple stems on the Ace. The bare Starry and Ace ceramic mouthpieces I find unusable because they get too hot.
I removed the steel mouthpiece screen as I think it's overkill and would clog fast when vaping hash, the ceramic filter works good enough and you can to use a pin to keep its holes clear. The ceramic filter can be removed from the silicon in the mouth piece and placed in the bowel very nicely as it has a lip to keep in from falling into the bowl and reduces bowel depth by about 5mm. The standard bowl is about 24.5mm deep.
The side panel covers(I have the carbon fibre) work good to protect from the heat, but wish it was wrapped all the way around as after a 10 minute sesh it's just like the Starry and is a hot potato and is why my Starrys have silicone skins.
For herb I'm a low temp flavour user and the Ace doesn't do so good with low vapor at around 375F, at around 385F it puffs pretty good and tasty, but after about 3 minutes vapor production falls off lots and needed a stir. I would stir twice in a 10 minute sesh to fully extract. You could run higher temps say 395-405F, but it would be harsher much like the Starry. What I found much to my amazement was eject the load slowly onto the top scoop platform and then push it back into the bowl and vape again and found the a refreshed bowl with good flavour way better than a stir. The gimmick just turned into a very nice tool for good vapor.
Now to the reduced bowl using the ejector idea as I actually got it to work. I used the cannister top off the Nano dry herb cannister and it fit the ejector slot below the slider button perfectly and being threaded the threads catch onto the slider button and the rounded bottom end of the slot and does not fall out with the slider spring pressure holding it in, amazing. I tried it alone reducing the bowl 7mm from 24.5mm to 17.5mm and with the ceramic filter sitting on top of the bowl which reduces bowl a further 5mm to 12.5mm. It works, but not very good as I needed a higher temps around 400F to get decent vapor. I feel reducing the bowl using the ejector also reduces the bowl surface area and as well heat into the bowl as this is a conduction vape, thus requiring higher temp. Using just the ceramic filter to reduce bowl size worked like a normal unreduced bowl not needing higher temp. A longer ceramic filter if possible might work to reduce bowl size with no ill effects. The only problem I have with ceramic filter sitting on the bowl is it makes it harder to do a stir using the ejector as the filter fits tight in the bowl and you have to hold it with a stir tool to keep it from shooting out of the bowl and ease it out slowly as that mother is very hot.
That's my initial impressions of the Ace, now figuring out how to modify the mouthpiece with a wpa like I did with the Starry, then this might be my goto vape for hash. They did a good job on this vape for the price.