I have both. Here's my two cents. I've had the Ripley for almost a year. When I got it I was all about it... It's definitely a great bike and performs very well. About two months ago I bought the SB115 and instead of going with a FOX, I decided to go PIKE Ultimate, Other than that the bikes are identical configurations.
Obviously the new bike always wins when it comes to ride timme, so I spent several rides on the Yeti... FOr me, it's an amazing bike, It fit perfectly, once I went to a 35 mm stem from a 50 mm, It just flat out fit... So needles to say I was completely sold.. Great bike I would highly recommend it. Now back to the IBIS, after riding the YETI I started to see the faults.. I could not get the fit the same, the fork was flexy as hell, I didn't like the rise of the handlebars .. The list goes on, maybe nt picking a bit as well... So I set out on a quest to get them the same, first I ordered the same 35 mm rise bars... Took measurements from the YETI for seat to bars and seat to cranks.... And finally ordered a PIKE Ultimate 140 along with the same stem 0 degree 35mm clamp... I cut the fork so the stem height was the same as the YETI, the head tube on L vs L is different, put it together and BOOM.. I have them feeling the same way, the perform the same way, acceleration, climbing cornering are as equal as you can get.... So for me, these tow bikes are awesome. If I had to choose one, it would probably be the YETI, having said that, as long as the IBIS has the PIKE Ultimate 140 fork, it blows the stock FOX 130 out of the water hands down. Obviously everyone's riding fit and style are different, but, You cannot go wrong with either of these bikes. I am probably going to get another PIKE 140 for the YETI. One more note, I have been riding mediums for ever... It as recommended that I go Large on the IBIS, I am glad I did. What I discovered is that I have been taking mediums and configuring them to be Larges. Longer stems, setback seatpost... SO when I bought the YETI, I also got a Large... I am 5' 8" and they fit like a glove