personally i find the expansion of your regular plastic/barrier pipe to be to much! everything has its pros and cons but i do think there are a lot of people abusing plastic pipes by not clipping and not using it to its full benefit of its length over copper by using manifolds to minimize fittings in walls, under floors and generally places that cant be accessed, obviously more pipe will be used but IMO its worth it ,
Iv been using the new TEC mlcp for awhile now , i like it , doesnt expand like your plastic and behaves more like annealed copper , not keen on the bend radius but with its 3 piece liner it makes the joint double sealed as to what it would normally be , coupled that with the 316 stainless fittings and you have a very good joint! expensive but good!!