Having built a lot of pedals now, including a lot of clones of the above what I would say is, if you can, try them with your own kit before committing. Pedals respond very differently to different amps particularly. Certainly a lot of the fuzz/distortion pedals can be really picky bar-stewards.
Anyone in the Yorkshire area is welcome to nip over and bring amps/guitars to try stuff if they like. I'm over there most weekends and can bring any of my pedals along that you might want to try.