PF's system has been crash tested and also crashed pretty badly by at least one customer.
Anyway, the important thing is that you're buying something with safety in mind. Grippa will do the job. I have its predecessor in my own van, the Gardiner super zero system (one of - I think - three that were ever installed). I'd have had Grippa for all our franchisees but Grippa didn't answer emails or phone calls three years ago when I was trying to get a system for the first franchisee. By all accounts their customer service has improved since then so you should be fine.
Vin