Hello hello! No trouble at all. 😀

The computer itself is a Gateway that I bought online for $550 about three years ago. It came with 6 GB of RAM, 1 TB hard drive, and a fairly decent graphics card. I played TS2 for quite some time with the factory components, but I’ve since upgraded it to add an NVIDIA GTX 560 card, new power supply, and a 250 GB SSD. If your financial situation allows you to swing it, I cannot emphasize enough what a difference the SSD has made in my life! ❤ I originally bought it exclusively for simming, but it’s so fast and lovely I use it for everything. 😛
Aside from needing the motherboard replaced less than a year after I got the computer, I haven’t had any problems with it and it runs TS2 perfectly on the highest settings (and loads my 17 GB of custom content in 20-25 minutes). Slight lag on large/crowded lots, but that’s to be expected. All in all, no complaints. 🙂 I’ve only tried TS3 once (and it was before I had the SSD), but I remember the game taking forever to load, even with only two expansion packs and minimal CC. And even once I was in-game, it took forever for things to render. :
TS4 also runs wonderfully from what I’ve experienced so far – negligible loading time, even though I already have 3-4 GB of CC. 🙂
Hope this helps! 🙂