These Oni switches are easily top-tier. My initial impression of this switch was that it reminded me of a Black Cherry Pie (BCP) frankenswitch in terms of looks, sound and feel... except better. Both have a long pole stem resulting in a quicker bottom out, but the Oni switch is waaaaay smoother and barely any stem wobble...
New budget favorite linear
TL;DR - Super smooth, excellent sounding long-pole linear switch but IMO requires lube and maybe films to be great. Right out of the box I was intrigued with these switches but a little disappointed with their stock form. They have a super slick housing that reminds me of the Durock POMS, and they also share that sort of resonant tone of the Durocks as well which I think is excellent. The housings are reasonably tight with minimal wobble, at first I didn't think films were necessary. The sound is noticeably scratchy, crunchy/pingy. My guess is some of this is the spring moving on the housing, as such I found spring lubing (bag lubed with GPL 105) was very helpful though didn't resolve the issue completely, maybe 90% better. Perhaps a heavier lube/oil would be better on these in the future. I tried a few different lubing techniques for the stem/housing and ultimately decided on just lubing the stem with Krytox 205G0 as lubing the lower housing seemed to have very little difference. I did make sure to lube the inner stem housing/pole and this pretty much took care of the remaining crunchiness. At first I used a Durock film since the housing was reasonably tight but found it didn't change much for the sound. Then over to Deskeys films and I feel this made the switch much deeper and more muted, both are my preference so I went with that. All said and done they are hugely improved over stock now. The long pole causes some natural loudness and clack but its quite pleasant and I personally enjoy the abrupt bottom out of the longer pole switches. In feel they remind me quite a bit of the Prevail Epsilon, very smooth just not quite as deep. Overall I think these will be my new go-to ESPECIALLY at the price. I think Divinikey knocked it out of the park with these!
Excellent aside from the spring
This could easily have been a 5 star switch in my opinion if the stock spring didn't have so much crunch. I cover more of it in my quick review https://www.youtube.com/watch?v=5ZkeL1j7mTo
My new favorite
Switch the springs and this is the best switch I've used, I have no idea why they chose the stock springs they did. This switch is amazing sounding and super smooth, also the actuation is right near the bottom out so it's fun to type on this. I lubed with krytox 205g0 and 105 on spirit complex 63.5 springs. These switches sound creamy and also poppy at the same time. Get these things seriously.
Top Tier Long Stem Linear Switches
I'm surprised these haven't blown up. I've tried a lot of switches and made many frankenswitches and these are probably one of my favorite linear switches that I've owned. I love long-stem linear switches, and Tecsee has made a lot of variations with different materials and stem lengths. These are hands down the best that Tecsee has done in that regard. I think these are probably in line with Epsilon (Lavender Housing + POM Linear Stem) switches in terms of feel and sound. BCP, Tungsten, Hoshizora, Blue Velvat, POM Linear and others are a lot louder or clackier than these (imo). The HPE housing material is super underrated. Bottoming out feels amazing and sounds deep on top of it being ridiculously smooth when lubed. There is virtually no leaf ping, which you can find in a lot of JWK switches even when lubed. I personally did not like the spring weight for these and opted to swap in some Gateron Yellow springs that I had which made the typing experience a lot more enjoyable for me. I don't see spring swapping as a negative for a switch because I'm particular with spring weights.