Hi. My 2 bits...from your list, we have had communication with Seamark and our experience so far has been very positive. We are reviewing to purchase one of their BGA rework systems, primarily from the video on youtube showing Louis Rossman running one of their older machines. Did a background check on them through other non-competing suppliers in Shenzhen and they came up as a very strong player offshore.
I do agree with the above post that there is strength in numbers. China has their own eco-system and unless you are closer to their factory, may have some start up pains. There is a very lengthy set of videos about Charm High and how their system did not fare well - at least initially. After installing electric feeders, the builder is now operational. A major pain to get to this status.
Our line is with the Emerald-X (aka Yamaha YV88X) and after some serious time investment, am very impressed on what this machine can do. Lots of spare parts available offshore and locally including nozzles and feeders to allow for this machine to stuff 0201 and we have even validated the use of 01005 parts. Granted the pick accuracy is not 100% for the 01005 but we did stuff hundreds of these components for giggles. Also placing WLCSP 1.4*1.4mm FPGA (16 ball) with this machine - mind blowing on what it can do for its age. Support has been overall very positive. The minor complaint is hearing about "oh the machine is old, may not be able to do this or that" - each and every time we have proved the factory wrong. This machine was way ahead of its time.
Seriously will consider their SMT machines again as we grow. I know that due to covid, the market is soft and there are deals to have - contact https://trans-tec-america.com/ for more details. If you want, can share the local rep who is very good here in Canada to get started. Hope this helps.
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