TCP's systems aren't the best and their range is very limited - I would agree with that. I had a TCP system fitted a few months ago and I hated it, completely. But over time I have come to appreciate it, especially after having had it cut and thinned out, and after I took some scissors to the hairline to re-shape it to suit me.
The cost of the system was £500 fitted. I would say it lasts around 4 months if you take care of it.
but the strength of the business is in their supply chain and retail stores. By that I mean that you can order a stock system and have it
fitted in 7 days at the hairdressers. And their system is easy to self-maintain because it's a thin skin base bonded with glue.
I have found it to be my detriment when ordering online from independent suppliers. The quality is good but I cannot find a stylist to cut and fit the system, not unless I am willing to pay extortionate prices at somewhere like Frankie & Cochrane, miles away in London.
I'm OK with (and prefer) self-maintenance, but you will find it very hard to find a stylist to do the initial cut and fit, when you buy the system online.