For laying out angles I currently use a bosch digital square, used for rafters and such. It doesn't sit flat everywhere but it gets the job done. I am curious if anyone is using some form of assembly square like the mtr18 from TSO. If you do or something similar how well does it work? Is it worth the money to you and why?

This is my current unit, well similar, mine is an older model. https://www.aonetools.co.uk/wp-content/uploads/2020/04/5aa24302e5bf3745600236.jpg


Thanks!

It depends on how large of a area I'm working and how precise I need to be.  I use several methods, that include

1.Speed square for quick rough work,
2. Bosch electronic angle finder for larger more accurate stuff,
3. TSO MTR mostly for checking for square since its the largest known good square I have ( I dont use it for laying out or cutting since I use CNC)
4. I use a small husky digital angle finder for doing trim type work (its smaller and easier to carry than the bosch and plenty accurate for trim)
5. For big stuff I will use a calculator and tape measure.
6. I also have and use a Starrett angle finder for my combo square but its markings are small and really hard to read for my middle aged eyes so I typically use that to copy a pre existing angle and then use it as a checker.   

Can you do a writeup on the Shinwa piece if you buy it. 

I make it a practice not to buy any equipment until just before I need it.  I wasted a lot of money over the years buying stuff that I thought I might need.  Now I wait until I actually need it.   So you will probably buy the Shinwa before me.  I see that Amazon.com sells the 60 cm unit (24") for $75.00.  That's the best price I've seen.

https://www.amazon.com/gp/product/B07PKBK6BJ?pf_rd_r=B56H2FY5SZ404NZDJ50D&pf_rd_p=5ae2c7f8-e0c6-4f35-9071-dc3240e894a8&pd_rd_r=ec364a57-2a49-4c51-ba95-9e5e84459284&pd_rd_w=fLMJr&pd_rd_wg=KL29r&ref_=pd_gw_unk

Amazon shows one (1) 5 star rating, but no accompanying reviews.

Here is the 30cm (12 Inch) version. Right now it is $49.

https://www.amazon.com/SHINWA-SLIDING-ADJUSTABLE-PRECISION-DEGREE/dp/B06ZZJDGN3

Let us know how you like it.

There is an easy way to check the 90 degree for square.  This video shows it for a combination square, but the technique works for all squares.

https://www.google.com/search?q=testing+a+combination+square&client=firefox-b-1-m&ei=GkLXYOb4Fs-b_Qb2hYbQBw&oq=testing+a+combi&gs_lcp=Cgdnd3Mtd2l6EAEYADIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjIGCAAQFhAeOgcIABBHELADOgIIADoFCAAQhgM6CAgAEBYQChAeOgUIABDJAzoFCAAQsQM6BQgAEJECOgIILjoECAAQCjoFCCEQoAFKBAhBGABQyDNYpu8BYKSKAmgEcAB4AIAB8gGIAesOkgEGMTQuNS4xmAEAoAEBqgEHZ3dzLXdpesgBCMABAQ&sclient=gws-wiz#kpvalbx=_cELXYIWaHIOTwbkPv7CEsA458


You can check the 45 degree by splitting the 90 in a similar manner.