JG Speedfit - a reliable option?

I have some central heating reconfiguration to do in an apartment a family member is buying and moving into (removing microbore back to the 22mm and fitting new standard 15mm rads). Was gearing up for copper 15mm but now considering pushfit but only a reputable brand like JG Speedfit. Would still go copper tails but any piping under the floor back to the 22mm would be plastic 15mm. Fools game or sensible DIY option