I have read so many posts saying two way is better than one way wireless. Well, this is true for the middle and upper end systems because they use a combination. Normal PIR's don't need two way wireless, only certain types really like video verification detectors etc need two way and top manufacturers have identified this. Purely 2 way systems are that way because the technology they are using is limited or they are not advanced enough to incorporate the two systems. Hence it tends to be the bigger companies that do. A good one way system is better than a cheap two way system. If you are only fitting a home installation with standard pir requirements, then a two way has no real-world advantage. As for claims by some companies that they arm quicker, that is just a load of BS. This is true for 1-3 detectors, but any more they take just as long.
Its simple, pay peanuts for products, monkeys have made them. I would not want a monkey made system protecting my family. If you want a cheap panel, buy a good cheap panel, not a **** cheap panel disguised by BS specifications. Alarms are the same as any electrical good, buy a Tekinika tv from asda, its specs suggest it is on the same par as a Samsung all singing - all dancing, but we all know it isn't, so buy a cheaper, less specified Samsung instead.
Rant over, Peace.....