previously i'm using Seg running with BT20Valve. now i'm using Altis 1.6 auto. thumbs up for my seg. if compare the comfort, both is the same, even i feel seg is more stable during high speed corner and top speed in highway. my seg using Titan and i did change all the bush, so no sounds from bottom. altis top speed not go to high, max bout 175 or 180 km/j, while my bt can reach bout 200km/j but both is different.
my advice, better stick to seg, upgrade to good suspension and do sound proofing.
p/s : altis also now using Titan .. ;)