1. Those are the more popular brands in the market.

2.  I'm not sure which is the best brand. I only bought from Osim. I think it's better to invest in a reliable one than to buy a cheap but not lasting one. Can pay by instalments, with no interest.

3.  How lasting? My first unit, I bought 10 years ago. Still using it today. The 2nd unit, more functions, can massage harder, been using for more than 1 year only. Asked once to come service it at my house then they reminded me to ask them to service again before warranty expires in 2 years time.

4.  Not sure it can crush bones lol. Just to be safe, if have health problem or recovering from operation, I think better don't use it.

5.  Not sure about blood vessel rupture, but after massage, body will feel hot a bit because of blood circulating our body, also certain part of the chair produces heat during massage. A bit warm only, not hot. A good foot massage, is important for our body. Just as a set of good tyres working for our cars.

6.  I won't say it's brutal. You can choose what type of massage chairs that you are looking for. Best if you go around and try them before buying.