My DK 45se HST was just delivered about 3 weeks ago and I love it. I too looked at the DK 45s, liked it alot but.. the seat didnt go back quite far enough for my Knees, the HST was only a few hundred more and it felt so natural. Also, I have hilly terrain in western MA, and the HST sits alittle lower and is just alittle wider than the 45s. Although I haven't been out on alot of hills yet because we're buried with snow, the few hilly places I've been, it has felt very stable. So, I guess what I'm saying is, with the wealth of experience 6 hours over 3 weeks of moving snow has given me ... I would highly recommend checking out th DKs or the DKse HST, I think you'll be happy you did.