IMEX buys from the same Chinese manufacturer as Graupner & MHD, KY Model.
www.kymodel-hobby.com
Graupner is KYs largest OEM customer & typically develops 3+ models annually which they are granted a 3-year exclusive. After that, the model is available to any KY customer which is why you see IMEX carrying the S-100 & Prinz Eugen. You can expect the same quality & components as you'll find in Graupner's RTR product.
For RTR boats, their quality & detail is good. I saw some of their newest designs last July at the Shanghai Model Expo & was impressed with what I saw in a 1/100 Fletcher DD & 1/24 MTB.
Chuck
"China is a sleeping giant. Let her sleep, for when she wakes she will shake the world." ~ Napoleon Bonaparte