The non-RFT do usually ride better than RFT's. I had non-RFT's with no spare and purchased a repair kit(compressor/tire repair goo) which will work in most flat tire situations. Now if you run over a piece of metal and really gash the tire, you will be SOL. I was comfortable with that option.

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12 X5 50i Sport
11 M3 DCT
11 X5 50i (lemon)
-- SOLD --
08 550i M-Sport
04 BMW 545I sport
07 BMW X5 4.8I sport
02 BMW X5 4.4i sport
01 BMW 540I M/sport
00 SL500
97 SL500