so, a while back I decided to get into 15mm Sci-Fi, to go alongside my massive Infinity 28mm addiction.
Couple of reasons for it:
1) There's tonnes of 15mm sci-fi stuff out there, and I like a lot of it. It seems to be the dominant sci-fi scale apart of course from 28mm (40K, Infinity etc).
2) It's cheap. As chips.
3) You can have lots of vehicles without it turning into a car-park, or looking a bit daft (IMO).
4) I like the look of the scale. I find it more satisfying with the area being fought over looking larger due to the small scale of the models.
5) I can comfortably play it on my kitchen table if I want to. I mostly play in Gamer's World but I sometimes play Infinity at home. That works for me, but I have to have a 4x4 sheet of wood I put on top of a smaller table. 15mm varies between anything between 2x2 feet and 8x6 plus.
6) If you decide you don't like a rule-set, you can just change rule-set without your model collection becoming somewhere defunct.
The two systems that I'm considering are the two most popular 15mm systems that I know of:
Gruntz (http://www.gruntz.biz/) - 9 dollar PDF download. Looks quite fast play. I bought the rules and they look good to me and it's receiving a lot of attention around the place - winning TTGN new rule-system readers vote last year. The basic mechanics are very similar to warmachine - with your stat +2d6 versus their stat. They have rules for Mech walkers, grav-vehicles, VTOL, mortars, jump-troops, etc etc. You can buy minis anywhere and point them up yourself.
Tomorrow's War (http://ambushalleygames.com/) - 20 euro for a delivered hard-back from http://www.bookdepository.co.uk . Sci-Fi version of the critically acclaimed Force on Force rule-set, which I also have, but I just prefer the Sci-Fi setting to Moderns. There is a beta points builder for it but it's more meant to be scenario based, which once you get past the change from what most of us are used to is actually wonderful - based on how great the scenario books I have for Force on Force anyway and the 6 scenarios in the main TW book. First Tomorrow's War scenario book is due out this year, and will be Aliens versus Genetically Modified Special Ops (colonial marines types). It's a good bit more crunchy than Gruntz and it's harder to learn but it's not particularly difficult. Here's a AAR of a TW game of mine - http://w-ired.org/forum/viewtopic.php?f=38&t=2151
I've played about 4 or 5 games of tomorrow's war now and really like it but it is quite crunchy. Yet to play Gruntz but I really think I'll like it too based on everything I've read - it appears slightly simpler and more gamey.
Anybody else play (or want to play) 15mm Sci-Fi?